Bumper/Valence Help

[CollinsE30]

Will the Early model IS Valence (picture above for reference) work on Plastic bumpers? I have an 88 325is with diving boards currently, but I have a set of plastic bumpers off of an 89 318i. If i swap the bumpers to plastic will the Early IS valence work with no modification?

[ELVA164]

I'd do some searching around as I'm positive other people have asked this question and gotten answers.

[Mr. Tasty]

I am pretty sure Funfgan did this. It will not fit without modification, as the plastic bumpers are designed differently from the metal bumpers.

Pictures

http://www.r3vlimited.com/board/showthread.php?t=260234

I can't find his build thread though