FCM used to buy Ground Control bumpstops, triple the price, and resell them. My advice is don't buy them from Fat Cat. Instead buy them from RE Suspension.

http://store.resuspension.com/produc...cat=334&page=1

$17.75 each.

1.968" H x 1.575" W Conical Foam Bump Stop - White - Soft



Or if you really want the Ground Control version...

http://www.ground-control-store.com/...tion.php/II=10

$12 each, your choice