[BMWM5Driver]

Where can I find a Brake Cooling Kit (e.g. the round holes and tubing in the lower front air dam)?

 

[thematrixz]

Go to dealer and ask them to search for these parts under E39 Aerodynamic package. I recently installed an M-Tech bumper for my 540IT, and they found them there, previously, the part guy kept searching under M5 bumper category, and couldn't find them.

 

[Keith97M3turbo]

Shawn, here's the link to the brake H/D mod
http://www.bmwm5.com/greg/brake_ducts/
you might find some others that posted too...
But in that link the part #'s are listed, as for the rings they are from Home Depot, they are Sweethart sink drains.
I posted a pic of mine below. Keith