does anyone know the part number that i need to buy to install a rear bumper from an MCSc on my MCc? i seem to recall seeing this somewhere but can't seem to find it. has anyone tried this with any success?

 

People on MINI2 have done the rear bumper swap from S to Cooper: http://www.mini2.com/forum/showthread.php?t=106910. If you do a search, you'll probably find additional threads. It sounds like the S bumper itself fits fine, but the black trim piece for the exhaust cutout needs to be the version for a pre-2005 Cooper. You can find numbers for all these parts at http://www.realoem.com.