you'll have to change the front fenders to the 71-72 to use the crome bumper but you can fix the original with bondo if you cant find one
hope this helps
I have a 1973 Mach 1 Mustang that I am working on and the old rubber bumper is all tore up. I really want a chrome front bumper but Ford never made them for the 1973 model will the 1971-1972 fit with little or no modification?