The '71 model year introduced the 4.10H-19 front tire, so required the wide fender, bridge, and stays. These were made in chrome plated steel for '71 and at least part of '72. The stainless '73-'75 fender is completely compatible with the '71 and it's fender bridge and stays. For use on a '68-'70 you must also use the '71-'75 bridge and stays.