I believe 71, 72 and 73 all interchange. 71 doesn't have jack slots but 72 & 73 does. otherwise, all 3 years share the dual lamp design on each side.I have a nice 72 rear bumper (one year only). Has bumperetes (have front also with bumperetes). Pm me if interested. I shipped one before to north Carolina (see my feedback member was alexhetti).
I mean. 73 had the bigger bumperetts but it’s the same design70 71 and 72 interchange. 72 is only year with slot for Jack. 73 is a completely different animal in style.