When I painted my B&W G3, I tossed the rubber piece in a junk bin. It didn't help me out any, but I did find it on my desk just now.

If you get crunched on your mod for the challenge and you want the rubber piece due to a mishap, just PM me through the site and I'll throw it in the mail.
MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop