BMW 5A0C423-08 Rear Left Driver Seat Cushion Bolster G26

( Manufacturer Part Number: 5A0C423-08 ), ( Part Type: Driver Seat Cushion ), ( Color: Cognac Sensatec ), ( Placement On Vehicle: Driver Side, Left, Rear ), ( Country Of Origin: Germany )

Review BMW G26 Rear Left Driver Side Seat Cushion Bolster Trim Oem fits I4 2022–2026

The **BMW 5A0C423-08 (2022 2026) i4 G26 Rear Left Driver Seat Cushion Bolster** is a precision-engineered, high-performance replacement part designed exclusively for the latest generation of BMW s compact luxury i4 electric vehicle, part of the G26 platform. Crafted to meet BMW s exacting standards of ergonomic comfort and structural integrity, this bolster cushion serves as a critical component of the rear driver s seat, ensuring optimal seating position, support, and long-term durability. Engineered from high-grade, breathable materials, it combines a plush yet firm upholstery with reinforced stitching to withstand the demands of daily driving, from city commutes to highway cruising. The bolster s ergonomic contouring is meticulously calibrated to align with the driver s lumbar region, promoting proper posture and reducing fatigue during extended journeys, while its seamless integration with the seat s frame prevents any unwanted movement or shifting. This part is fully compatible with the i4 s advanced driver-assist systems and adaptive seating features, ensuring that aftermarket installation does not compromise the vehicle s functionality or safety. Whether replacing a worn-out original component or upgrading for enhanced comfort, this bolster delivers a perfect blend of BMW s signature craftsmanship and modern automotive engineering, maintaining the i4 s signature blend of sporty agility and refined luxury.

### **Pros and Cons of Buying a BMW 5 Series (G26) 2022-2026 i4 Rear Left Driver Seat Cushion Bolster (Part #B50C423-08)**

1. **OEM Quality and Fit** BMW parts are engineered to meet exact specifications, ensuring proper fit, comfort, and durability. The bolster cushion is designed to match the original seat structure, maintaining ergonomic support.

2. **Enhanced Comfort and Support** The bolster provides additional lumbar and side support, reducing fatigue during long drives. This is particularly beneficial for drivers who spend extended periods behind the wheel, as it helps maintain proper posture and reduces lower back strain.

3. **Compatibility with Aftermarket Upgrades** If you ve installed aftermarket seats or seat covers, this bolster can help restore or improve fitment, ensuring the seat remains secure and functional.

4. **Durability and Longevity** BMW parts are built to last, often outlasting generic or third-party alternatives. The bolster is likely made from high-quality materials resistant to wear, cracking, or deformation over time.

5. **Aesthetic Consistency** The part is designed to match the original interior styling of the G26 5 Series, ensuring a seamless look when reinstalled. This is important for maintaining the vehicle s premium appearance.

6. **Warranty Coverage** Purchasing directly from BMW or an authorized dealer may include warranty protection, offering peace of mind against defects in materials or workmanship.

7. **Improved Safety and Stability** A properly fitted bolster ensures the seat remains securely in place, reducing the risk of shifting during sudden stops or impacts, which can enhance safety.

8. **Ease of Installation** While installation may require some mechanical skill, BMW parts are typically straightforward to fit, especially if you re familiar with seat adjustments or have access to a manual.

---

1. **High Cost** BMW OEM parts are significantly more expensive than aftermarket alternatives. The price of the bolster alone may be prohibitive for some buyers, especially if other seat components are also needed.

2. **Limited Availability** Depending on the region, sourcing this specific part from an authorized dealer or BMW service center may be difficult, potentially requiring online purchases or extended wait times.

3. **Potential for Overkill** If the seat itself is not damaged or worn, replacing just the bolster may not be necessary. In some cases, minor adjustments or aftermarket solutions could suffice, making this purchase unnecessary.

4. **Installation Challenges** While the part is designed to fit, improper installation (e.g., misalignment or overtightening) could lead to discomfort or even damage to the seat mechanism. This may require professional assistance, adding to costs.

5. **Resale Value Impact** If you plan to sell the vehicle later, some buyers may prefer original equipment parts. However, others may not notice or care about the bolster s authenticity, so this is situational.

6. **Alternative Solutions Exist** For those on a budget, aftermarket bolsters or lumbar support cushions (e.g., from brands like Recaro or memory foam options) can provide similar benefits at a fraction of the cost.

7. **Time-Consuming Process** Removing and reinstalling the seat may take several hours, especially for inexperienced DIYers. This downtime could be inconvenient if you rely on the vehicle daily.

8. **Potential for Counterfeit Parts** If purchasing from third-party sellers (e.g., eBay, Facebook Marketplace), there s a risk of receiving non-OEM or low-quality replicas. Always verify authenticity through BMW s part numbering system or a trusted dealer.

---

The **BMW 5 Series (G26) i4 rear left driver seat cushion bolster (B50C423-08)** is a high-quality, reliable replacement part that offers superior comfort, support, and longevity compared to aftermarket options. It is ideal for owners who prioritize **OEM fitment, durability, and interior consistency**, especially if the seat is already worn or the bolster is damaged. However, the **high cost, potential installation challenges, and availability issues** make it less practical for casual buyers or those seeking budget-friendly solutions.

If your primary goal is **improved comfort and support**, an aftermarket bolster or lumbar cushion may be a more cost-effective alternative. But if you re restoring or maintaining the vehicle to factory specifications or if the seat s integrity is compromised this OEM part is the best choice for long-term reliability.

---

- You re restoring the vehicle to original condition.

- The seat is damaged or the bolster is cracked/deformed.

- You prioritize BMW s build quality and warranty coverage.

- You re comfortable with the higher cost and potential installation effort.

- You only need temporary or minor support (e.g., an aftermarket lumbar cushion).

- The seat is otherwise functional, and the bolster is only slightly worn.

- Budget constraints make the OEM part unaffordable opt for a reputable aftermarket brand (e.g., Recaro, SeatCraft).

- You re unsure about installation and prefer professional help.

For best results, **purchase from an authorized BMW dealer or a trusted online retailer** (e.g., BMW Parts Online, RockAuto) to ensure authenticity. If installing yourself, follow the vehicle s service manual carefully to avoid damaging the seat mechanism.

Details:

Engine warranty requirements. Please be advised. These are consumables. So whatever you do, sometimes it happens.

Exterior color: C4W Skyscraper Grey Metallic. Body style: 4 Door. So what you see is get. Not a problem.

Before installing the engine, replace: gaskets valve cover gasket, oil pan gasket most important ones, fluids, seals, filters, spark plugs, belts, aluminum bolts the ones holding valve cover, pan, etc. Sometimes even tested parts someway arrive in an uncorking condition. If not warranty voids. For many modern cars, a wide range of electrical components such as: headlights, taillights, steering racks, electronic suspension systems, various control modules, amplifiers, radios, battery and others are not simply plug-and-play.

Compatibility and Fitment. Engine components such as timing chain, VVT gears Vans, VTEC, etc. Vacuum pumps, chain guides are not covered. The part may not fit even some vehicles listed depending on the trim. Labor, programming, and other associated costs NEVER covered;.

Any accessories alternator, power steering pump, a/c compressor, etc. Left on the engine for installation convenience only. Used cars we buy for parts a treated differently by many different people years. Interior color: Cognac Sensatec. That can lower the risk of installing a faulty part.

Transmission: RWD Rear Wheel Drive. The items are sold totally as in the pictures. Shipping details. Item Condition.

However, used parts are tricky to deal with. Dear buyer, despite offered parts compatibility in the listing, that is NOT a 100% guarantee fitment. Accessories are not under warranty. Do you wish to return the item.

The part may fit some other vehicles rather than listed. Odometer: 32.598 mi. Besides, the human factor is always a weak point.

part #: 5a0c42308 price

• $62.99

specifications seainterio:

• for models: I4
• for makes: Bmw
• for years: 2022-2026
• mpn: 5a0c423-08
• part type: Driver Seat Cushion
• color: Cognac Sensatec
• placement on vehicle: Driver Side, Left, Rear
• country of origin: Germany

seller seainterio:

• # reviews: 5459
• rating: 99.8%
• city: Pacolet, South Carolina

payments seainterio:

• other
• wallet: Apple-pay
• credit card: Diners-club

general seainterio:

• condition: Used
• Interior Parts Accessories > Seats, Parts Accessories > Seats

offer seainterio:

• sold: 0
• started: April 22, 2026
• quantity: 1
• options: Ship-to-home
• availability: In Stock

shipping seainterio:

• type: Fixed
• cost: $20.00
• transit: 3-8 Days
• carrier: UPS
• class: Standard
• service: UPS Ground

returns seainterio:

• policy: Returns Accepted
• paid by: Buyer
• time: 30 Days

Bmw 5A0C423-08 Is Similar To:

• 020-146 4 Genuine Bmw Control Light Seat Safety Belt (25% similar) Bmw E21 control light seat safety belt 3'ER please verify part number and connector to ensure fitment. Used item with light wear and blemishes, as seen in the E21 3'ER control safety belt fits 1982 FROM:05 01 1976 TO: ended. Doing this gives us an opportunity to troubleshoot the situation best ...(September 1st, 2018)
• 52-11-1-824-773 Bmw Left Bottom Horsehair Seat Pad Oem (30.7% similar) Left cushion bottom pad oem for bmw ti Ti this is a brand new horsehair straight from germany. Not many left, possibly discontinued. Products encompass pre-sewn seat upholstery, complete carpet sets, convertible tops, tonne covers, top boots, headliners, rubber seals and miscellaneous interior ...(July 24th, 2018)
• 52-11-1-824-774 Bmw Right Bottom Horsehair Seat Pad Oem (27.5% similar) Brand new, never been taken out of the plastic it came in. Fits: bmw ti Ti model's material: rubberized horsehair manufacturer: impart: about world upholstery trim world trim is a manufacturing company that specializes on reproducing soft interior products found in older, high-end European ...(July 24th, 2018)
• 52-12-1-824-775 Bmw Backrest Horsehair Seat Pad Oem (34.3% similar) Products encompass pre-sewn seat upholstery, complete carpet sets, convertible tops, tonne covers, top boots, headliners, rubber seals and miscellaneous interior panels all made in the USA but sold over world. Not many left, possibly discontinued. Backrest pad oem for bmw ti Ti this is a brand new ...(July 24th, 2018)
• 61318368934 Bmw E39 E38 Oem (18.2% similar) Part come off a 2003 bmw 525I. Up for sale is a oem original bmw E38 E39 switch...(September 5th, 2017)
• 635csi Driver 633csi Side Seat Leather Bmw (38.4% similar) ...(August 18th, 2015)
• 8198485 Bmw Oem E39 Rear (18.7% similar) Part come off a 1999 bmw 528I...(September 30th, 2017)
• 8198500 Bmw Oem E39 Front (13% similar) Up for sale is a oem original bmw E39 5 series seat belt...(October 30th, 2017)
• 2-point Bmw 1974-1976 2002 2002tii Rear Retracting Seat Belts Repa Original (43% similar) Bmw 2002 2002 TII E10 probably earlier years as well original reap rear 2 point seat belts very good working condition need cleaned up a bit no cracks or tears missing one bolt washer nut...(August 16th, 2016)
• Detroit 7078 Oem 1997-99 Bmw Roadster German (20.5% similar) There are 6 yards available. New old stock oem upholstery fabric for german vehicles bmw the color is black this piece 55 inches wide. Actual item in photos...(March 10th, 2017)
• 3.0 Seats Bmw Cs Rear Bucket E9 Pair (28.6% similar) In storage for 18 years. Ship to lower 48 us states only. 2 rear bucket seats from a one seat has a tear. Price is for both seats. Black leather and cloth...(June 14th, 2015)