you dont really need them
once you put the caliper and the wheels on they will stay there
I should have a set sitting around if you want to buy them off me...but like I said, they arent necessary. My friend and I roll around w/o them all the time, no issues. How could there be?
part 21 in the pic -
93600-06014-0H SCREW, FLAT (6X14) $0.32