Shim for E46 M3 rear bumper panel sag

Removes the sag and gets the smallest clearance for the bumper to body without contact.

Just slot the part into the support fender (51127895643 / 51127895644) and install the bumper as usual. The weight of the bumper will now rest on the whole fender support instead of only the tiny screw in the wheel well. Also improves longevity by relieving the part that usually breaks off.

The 5mm part got me the smallest clearance possible and fit perfect, but I included a 3mm version in case you need a bigger gap.