They are only like $20 each from getbmwparts.com, I ordered a set, took my bumper off to install them to find out my car already had them. They must have come with the car new because the person I bought it from did not install them. I did have to modify my fender wells to create the opening. Kind of a weird series of events. Are you sure you don't already have them?
timmy, i dont think i saw them on mine last time i took off the bumper, but
ill pull off my bumper one more time later this week to check again to make sure.
also check to make sure that i have the necessary flow to get to the brakes!
steve, if u want to part with them, i would love to pick them up off ya after i make sure.
planning to do track day next month so need to address this =D