Don't cheap out here. Get the proper part from Tower or a LHS. It needs to fit properly or it will bang around in the slot and cause damage to the crank and the hub. This piece drops out rather easily as I have alost lost mine on several occasions now. Took about 2 hours hunting through my carpet one night to find it. [:@] Most keys come in the full crescent shape anyway so you would still have to cut and fit to size. Just buy the correct part, PLEASE.