I don't believe you can be sued for an infringement of sorts for reproducing their part. Just so long you don't claim its original. It should obviously for this purpose be labeled a reproduction part. People make reps of anything, from wheels to spoilers. Nothing illegal about it unless you are representing it as an original.

__________________
2001 BMW X5 3.0 5spd Sport
-aFe Intake
-E46 Sport seat retrofit with Heat
2007 Mini Cooper S 6spd