I used these:
Image: ACE TRADING BHDW 4 01-3028-505 "ACE" WALL DOOR STOP (pack of 5)
I just used a razorblade to carefully cut the raised portion leaving only a large white, self adhesive, washer.
Hard to see here. Im not at home for a couple weeks but I'll try to find a better pic:
http://www.clubgp.com/owners/pics/5240.jpg