Well that's a new one on me I've an 07 XTX and just undo the two bolts and the caliper comes off I've been trying to graft AP 6 pot caliper on and I've had the original tied up out of the way and when I put the original back on just parted the pads and slipped it on two bolts in and happy days.

http://www.xt660.com/showthread.php?t=21168