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The OE number 6Q0512131B is one of the most frequently searched reference codes for front strut bump stops in the Volkswagen Group range. If you are a foreign trade buyer sourcing strut bump stops for Audi, Seat, Skoda or Volkswagen models, this guide explains what the part is, which vehicles it fits, how the polyurethane construction differs from standard rubber, and how to place a reliable order with a auto parts supplier that supports both standard and custom specifications.
Most international buyers find a replacement bump stop through one of several common search patterns: part type + specification (e.g. strut bump stop dimensions), part type + supplier, part type + OEM, vehicle model + part, custom + supplier, or directly by the OEM number. Writing product listings and pages around these phrases helps a supplier match the queries that purchasing teams actually type into Google and trade platforms. When you search by the OE reference 6Q0512131B, you should be able to compare the specification table, the physical dimensions and the supplier capability in one place rather than moving between several sources.
For a purchasing manager, the most valuable page is one that answers four questions immediately: does the part match my vehicle, what are the exact dimensions, is the supplier able to produce standard and custom versions, and what are the delivery and warranty terms. The rest of this article answers each of those points in turn.
This replacement part is a suspension bump stop that sits on the front strut rod and cushions the suspension when it compresses, preventing the damper from bottoming out. The following parameters describe the part as supplied by Bonpora:
| Product Name | Strut Bump Stop |
| OE Reference | 6Q0512131B |
| Bonpora Part No. | 4110009 |
| Vehicle Fitment | Audi / Seat / Skoda / Volkswagen |
| Dimensions | Φ18 x Φ57 x 125 mm |
| Material | Polyurethane |
| Country of Origin | China |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
Because bump stops are a wear item, cross-checking the OE number with the year, model and chassis code of the target vehicle remains the most reliable way to confirm compatibility before purchase.
Parts carrying the 6Q0 prefix belong to the platform used across many compact Volkswagen Group models. The 6Q0512131B reference is commonly associated with front strut assemblies on vehicles such as certain Volkswagen Polo, Audi A2 and early A3 variants, as well as corresponding Seat and Skoda models built on the same architecture. Because model years and regional specifications vary, buyers should verify the OE number against their exact vehicle identification number (VIN) rather than relying on the platform name alone.
Three checks are useful in practice: confirm the OE number printed on the original part, compare the outer diameter and height with the replacement dimensions (Φ18 x Φ57 x 125 mm), and verify the year and engine code of the target car. If the original part has worn down or its marking is illegible, a comparison with the strut housing measurement is a practical alternative.
Original-equipment bump stops are often moulded from rubber, while this replacement uses polyurethane. Polyurethane is generally more resistant to oil, grease and environmental cracking, and it tends to hold its shape under repeated compression better than natural rubber in the long term. This can translate into more consistent damping feel over time.
Rubber stops are soft, quiet and inexpensive, which is why OEMs commonly use them. Polyurethane stops offer greater hardness stability and a firmer, more progressive compression response. The trade-off is that polyurethane can be noisier in some applications and may be less compliant at very low temperatures. For an aftermarket replacement, the choice usually comes down to whether the buyer prioritises OEM-like softness or a firmer, longer-lived material.
Buyers frequently search by part type + specification, part type + supplier, part type + OEM, vehicle model + part, or OEM number when sourcing on foreign trade platforms. The 6Q0512131B code is the fastest search key because it is a manufacturer-issued reference shared across the Volkswagen Group service network. When you enter the OE number, you can compare multiple strut bump stop listings and suppliers side by side.
OE numbers are not always a one-to-one guarantee. Superseded versions, supplier sub-codes and regional variations can exist, so it is worth treating an OE match as a strong signal and confirming physical dimensions separately. If the listing shows a different OE code than the original part, ask the supplier to confirm the measurement before payment.
For a wear part such as a bump stop, three inspection points matter most before shipment: the hardness and surface finish of the polyurethane, the accuracy of the bore and outer diameters against the drawing, and the presence of cracks, voids or flash at the moulding edges. A reputable supplier will typically provide photographs or a short video of the produced batch and, for larger orders, a pre-shipment inspection report covering dimensions, hardness and visual quality. Confirming these checks in the order terms avoids disputes at arrival inspection.
Beyond the standard replacement, many suspension parts buyers need variations in hardness, colour, dimensions or branding. Bonpora offers both OEM-equivalent production and custom design support, which can cover custom hardness, printed or laser-marked part numbers, custom packaging and private-label options for distributors and workshop chains.
Common requests include a specific Shore hardness for firmer or softer damping, a custom outer diameter to suit modified strut assemblies, colour coding for workshop identification, and branded packaging for resale. When requesting custom parts, supply the target dimensions, hardness value if known, and intended vehicle platform so the supplier can confirm feasibility and minimum order requirements.
Foreign trade buyers typically ask for sample confirmation, order quantity (MOQ), unit price by volume, and an incoterm such as FOB or EXW before placing a production order. For this strut bump stop, standard lead time is 15-30 days and orders leave in neutral export packaging. It is worth agreeing in writing on the acceptable dimensional tolerance, hardness range, packaging carton specification and the warranty remedy for defective units, since these terms define what is covered by the 1-year warranty. Custom and branded production may require a longer lead time and a separate mould or tooling charge, which should be confirmed at quotation stage rather than after the order is placed.
Standard orders ship in neutral export packaging to protect parts during transit and avoid brand interference in local markets. Typical delivery time is 15-30 days, depending on quantity and production status, and the part carries a 1-year warranty. For large or custom orders, it is recommended to confirm the lead time, packaging format and warranty terms in writing at the quotation stage.
A strut bump stop cushions the front suspension at full compression and stops the damper from bottoming out. It typically needs attention when the car develops knocking noises on rough roads, a harsher ride over bumps, or visible cracking and collapse of the old stop during inspection. Many workshops replace it together with the strut mount when servicing the front suspension.
No. The reference belongs to a specific platform and model range, not to every car from these brands. Always match the OE number and physical dimensions (Φ18 x Φ57 x 125 mm) to the exact vehicle using its VIN and model year before ordering.
Polyurethane generally resists oil and wear better and holds its shape under repeated compression, which can extend service life. It also tends to give a firmer damping response. The main drawback is that it can be slightly noisier and less compliant in very cold weather, so the best choice depends on the vehicle and driving conditions.
Yes. Custom design support covers hardness, dimensions, colour, marking and packaging, including private-label options for distributors. Share the target specification and expected order volume with the supplier to confirm feasibility and lead time.
For buyers looking to consolidate their suspension parts sourcing, an experienced supplier that cross-references OE numbers, offers polyurethane options and supports custom production can simplify the process. Request a quotation with your part number, target quantity and shipping destination to confirm availability, price and delivery time.
