Cup Washer Problem

Hey guy's we upgraded my darts suspension from a 6 cylinder rear end to an 8 3/4 rear end. Also upgraded the front suspension to disc, but my problem is that we ordered some nice shocks and when we opened the box there was no cup washers. The existing ones i have are to small and we cant seem to find them anywhere (home depot, pepboys, etc.) do any of you guys know where i can pick up a couple cup washers? thanks, rob.