RHuddle56,

Brothers sells the rear fender clutch-head bolts in stainless (complete set: bolts, fender washers, lock washers, and nuts).

Search for RFB54CL (Rear Fender Bolt '54 CLutchhead). The set is not cheap ($35) but it was stainless (you might want to confirm with them that the set is still stainless steel).

http://www.brothersonlinestore.com/store_ns.asp

Tim