BMW part number 51718046084 is the lower-right front fender-liner component used on BMW Z4 M applications in the E85/E86 generation. This is a good example of a relatively simple plastic component becoming much harder to source than its function would suggest.
Specialist BMW listings identify 51718046084 specifically as a Genuine BMW front lower-right fender liner for the Z4 M, while current supplier listings can show the part with no firm delivery ETA. Check the specialist BMW application reference.
BMW 51718046084 at a glance
| Check | Verified detail |
|---|---|
| BMW article number | 51718046084 |
| Component | Front lower-right fender liner / lower wheel-arch cover |
| Platform | Z4 M E85/E86 application |
| Position | Front right, lower section |
| Main sourcing issue | Backorder / No ETA / limited genuine stock |
Why this Z4 M liner is difficult to find
The ordinary Z4 and the Z4 M should not be treated as identical underneath simply because they share the E85/E86 body family. M-specific bumper, underbody and cooling arrangements create different plastic components in several locations.
That is why an inexpensive listing described only as "BMW Z4 right fender liner" is not enough. For this repair, the exact number matters.
Why the liner matters
The liner helps shield the area behind the bumper and wheel arch from water, stones, dirt and tyre spray. If part of it is missing, surrounding fasteners and components become more exposed, while remaining sections of the liner can move at speed.
On a Z4 M Coupe or Roadster that is being preserved in original condition, correct mounting geometry is also important.
Used genuine vs aftermarket
A good used genuine liner can be a sensible solution when new supply is uncertain. The key is condition. Old plastic can look acceptable in a photograph yet have cracked mounting holes or repaired tabs.
- Inspect every mounting hole.
- Check the lower edge for road impact.
- Look for tyre-rub marks.
- Check for melted or distorted plastic.
- Reject poorly repaired mounting tabs unless the repair is clearly disclosed.
- Ask for the BMW number or donor VIN when possible.
Looking for BMW 51718046084?
Search current BMW parts listings by OEM number, model or VIN. For scarce components, ask the supplier to confirm physical availability before ordering.
What to send a supplier
- Full VIN
- BMW number 51718046084
- Z4 M Coupe or Roadster
- Production month
- Photographs of the damaged area
- Destination country
- Whether used genuine stock is acceptable
Frequently Asked Questions
What exactly is BMW 51718046084?
It is a lower-right front fender-liner component for BMW Z4 M E85/E86 applications.
Does 51718046084 fit every BMW Z4?
No. Do not expand Z4 M application data to every ordinary E85/E86 Z4. Confirm by VIN.
Is the part completely discontinued?
Availability is inconsistent. Current specialist listings can show no ETA, so physical stock should be confirmed before payment rather than assuming that every indexed product page represents inventory.
Can I buy a used genuine liner?
Yes. A structurally sound used genuine liner can be preferable to an inaccurate reproduction.
Can a cracked liner be repaired?
Some plastic repairs are possible, but repair quality and the location of the crack matter. Multiple failed mounting points make replacement more attractive.
What is the matching left-side part?
Do not infer a part number by changing the final digit unless it is confirmed in current BMW application data. Verify the required side through the VIN catalogue.
Why should I keep the damaged original?
It provides a useful reference for shape, mounting points, fastener positions and identification while sourcing a replacement.
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