3 door and rs500 are exactly the same size
However Paul has piked up on a good point
My front bumper on my Lui eggenberger car has a front bumper that is 20mm wider than the other 3 rs500 bumpers i have on the shelf , so im sure that some were made wider for eggenberger
These pics show the fitment on a std rs500 and is the same as a std 3 door ,, all these are differant cars