Stumbled upon an MZ3 forum and seen pics with this bumper apron. Found them on ebaY for less than what a rear bumper lip would cost. It's obviously for MZ3 application but what are the chances this could work on the 5?
my guess would be "No". the 5 has a steeper rear bumper than the 3 - the 3 rear bumper wraps under more than the 5 does. you could probably "Make" them fit, if you really wanted to, but it would probably take a bit of work.