VW SEAT Skoda Strut Bump Stop 6Q0512131C | OEM Replacement Supplier & Custom Manufacturer

The 6Q0512131C strut bump stop is the rear suspension compression buffer fitted to Volkswagen Group small cars built on the PQ24 and PQ25 platforms, including the VW Polo, SEAT Ibiza, Škoda Fabia and Audi A1. When the rear suspension compresses fully over potholes or heavy loads, this polyurethane buffer cushions the strut before metal-to-metal contact occurs, protecting the shock absorber, spring seat and chassis. Bonpora supplies this part as Bonpora Nos 4110037, a direct aftermarket replacement manufactured in microcellular polyurethane to match the original dimensions of Φ12 × Φ57.8 × 114.7 mm. As an experienced auto parts supplier, we support both catalog distribution and fully custom manufacturing programs for importers, wholesalers and suspension brands worldwide.

What Is the 6Q0512131C Strut Bump Stop?

A strut bump stop—also listed in VW parts catalogs as a stop buffer or rubber buffer—is a cylindrical foam element that slides over the piston rod of the shock absorber, inside the protective dust cover tube. Its job is progressive: during normal driving the buffer is never touched, but when the suspension reaches the end of its travel, the microcellular polyurethane compresses in a controlled way and absorbs the final portion of the impact energy.

The 6Q0512131C variant is the shorter rear-axle version in the 6Q0 512 131 family. According to the VW catalog data, it has a nominal height of about 113.5 mm and was released for vehicles with sports or lowered rear suspension, identifiable by factory PR codes such as 1JS. The standard-height sibling, 6Q0512131B, measures roughly 123–127 mm. Choosing the wrong height changes the available suspension travel and the ride characteristics, so verifying the OE number—or simply measuring the removed buffer—is an essential step before ordering.

Bonpora manufactures this profile in microcellular polyurethane, the same material family used by the original part. Compared with simple rubber buffers, quality PU foam offers a stable compression curve, better resistance to permanent set, and reliable performance from roughly −40 °C to +90 °C—conditions typical of European winters and hot export markets alike.

Technical Specifications

The key data for Bonpora Nos 4110037 is summarized below. Buyers matching an existing sample should compare height, core hole and outer diameter—all three are the identifiers that determine fit.

Vehicle Applications: Which Models Use 6Q0512131C?

This rear bump stop was fitted across a wide production range from roughly 1999 to 2021, covering petrol and diesel engines from 1.0 L up to 1.9 TDI. The application lists below follow aftermarket catalog data; because Group platforms share many chassis components, the same buffer appears under several brand names. Final confirmation against the vehicle VIN or the PR code on the data sticker is always recommended.

Volkswagen applications

The buffer serves the rear axle of the VW Polo IV (9N/9A) series from 2001 to 2009, including the Polo Fun and CrossPolo variants, as well as the Polo Classic and Polo Derby sedans (9A2/9A4/9N2/9A6). It continues on the Polo V (6R/6C) from 2009 to 2017 and the related Polo sedan and Vento models (602/604/612/614) built for China, Russia and Latin American markets. The VW Fox (5Z)—sold in Brazil as the CrossFox, Suran and SpaceFox—uses the same rear buffer, as do the up! (121/122) city cars from 2011 onward and the South African Polo Vivo.

SEAT applications

For SEAT, the part fits the Ibiza III (6L) and Córdoba (6L) from 2001 to 2009, the Ibiza IV (6J) from 2008 to 2016 on specific suspension codes, and the SEAT Mii (KF) from 2011 to 2019, which shares its platform with the VW up! and Škoda Citigo.

Škoda and Audi applications

The Škoda range covers the Fabia I (6Y) from 1999 to 2008, the Fabia II (5J/542/545) including the Combi estate from 2006 to 2014, and the Fabia III (NJ) from 2014 to 2021, together with the Citigo (NF). On the Audi side, the A1 (8X) from 2010 to 2018 uses the same rear buffer family, with the shorter C version assigned to the sports suspension builds. Audi A2 (8Z) catalogs also reference this buffer family.

Practical note for parts departments: the fitment of this buffer depends on the suspension PR code rather than the engine. Two Polo 9N cars with the same 1.4 L engine can require different heights—one with standard suspension (B, taller) and one with sports suspension (C, shorter). This is why catalog lookups by engine alone are not sufficient.

6Q0512131C vs 6Q0512131B: How to Tell Them Apart

Because both variants share the same core hole and outer diameter, the only reliable visual difference is height:

Workshops replacing both sides should therefore measure the removed buffer or read the PR code from the vehicle data sticker before ordering. Mixing heights between the left and right rear axles is not recommended, as it creates uneven bump travel and can produce knocking noises over rough roads.

Aftermarket Cross-Reference Numbers

The 6Q0512131C appears in several aftermarket ranges under different internal numbers. The most commonly cited equivalents are listed below; note that some suppliers group the B and C heights in one listing, so the stated height in millimeters is the decisive check.

Related family numbers you may encounter during cross-referencing include Meyle 100 742 0009, febi bilstein 23410, Optimal F8-6723 and Ruville 835415, which are primarily assigned to the taller 6Q0512131B standard variant. Confirming the height before shipment prevents most returns in this product group.

Signs of Wear and Replacement Guidance

Strut bump stops are wear items, and on small cars that carry heavy city usage they often need attention between 80,000 and 150,000 km. Typical symptoms of a degraded rear buffer include:

• A hard knocking or thunking noise from the rear axle when driving over speed bumps or potholes.
• The rear of the vehicle bottoming out when loaded with passengers or cargo.
• Visible crumbling, powder residue or compression set when the dust cover is removed.
• A noticeably harsher ride, because the buffer no longer provides its progressive cushioning stage.

When replacing shock absorbers, professional workshops inspect the bump stops and dust covers at the same time, since reusing a cracked buffer shortens the life of the new damper. Buffers should be replaced in pairs per axle to keep the suspension response symmetric. The polyurethane material of Bonpora Nos 4110037 is formulated to resist crumbling and water absorption, which are the two most common failure modes in this component class.

Custom Strut Bump Stop Manufacturing at Bonpora

Beyond the standard catalog program, Bonpora operates as a custom suspension buffer manufacturer for brands that need their own specifications. Working from a drawing, a dimensional table or a physical sample, our engineers can produce strut bump stops with custom core and outer diameters, heights from roughly 40 mm to 200 mm, and microcellular polyurethane densities tuned for the required compression curve. Tooling is developed in-house, which keeps sample lead times short and unit costs competitive at volume.

Typical custom projects include buffers for vehicles outside the VW Group range, heavy-duty versions for taxi and fleet programs, and private-label production for suspension kit assemblers. Custom options cover material hardness, color, laser-marked part numbers and branded packaging. Whether you need a single container of catalog parts or a developed-to-drawing program, our team provides drawings and samples for approval before mass production. Buyers sourcing Volkswagen auto parts for the aftermarket can combine this buffer with our wider strut bump stop and suspension range in one shipment.

Ordering Information

Bonpora Nos 4110037 (OE 6Q0512131C) is produced with a standard lead time of 15–30 days and shipped in neutral export packaging, ready for repacking under your own brand. The part carries a 1-year warranty, and MOQ is flexible for distributors testing the market or consolidating mixed-container orders. For quotations, height confirmation or custom development requests, contact us for a quote on VW Group suspension bump stops and our export team will respond with technical data and pricing within one working day.

FAQ

Is 6Q0512131C the same part as 6Q0512131B?

No. They belong to the same rear buffer family and share the same core and outer diameters, but they differ in height: 6Q0512131B is approximately 123–127 mm for standard suspension, while 6Q0512131C is approximately 113.5–114.7 mm for sports or lowered suspension (for example PR code 1JS). Measure the removed buffer or check the PR code before ordering.

Which vehicles does the 6Q0512131C rear bump stop fit?

It covers the rear axle of VW Polo IV (9N) and Polo V (6R/6C), Polo sedans, VW Fox and up!, SEAT Ibiza and Córdoba (6L), Ibiza (6J) and Mii, Škoda Fabia I/II/III and Citigo, and Audi A1 (8X), on the sports suspension variants of these models. Always confirm against the VIN or suspension PR code, since the same models may also use the taller B variant.

Can Bonpora produce custom strut bump stops to my drawing or sample?

Yes. Bonpora supports OEM and ODM manufacturing of strut bump stops with custom dimensions, polyurethane density and hardness, color, part-number marking and packaging. Send a drawing or a sample and we will provide tooling proposals, dimensional drawings and pre-production samples for approval.

What are the MOQ, delivery time and warranty?

MOQ is flexible, especially for mixed orders that combine this buffer with other catalog items. Standard production and delivery time is 15–30 days, goods are packed in neutral export packaging suitable for private-label distribution, and the warranty period is 1 year.