[leddzepp]

NoNeck- They are all cast like that. I have a set with the same numbers on my 72. As long as your tie rods and ball joints bolt up, you have the "correct" ones. Before I bought mine off of C/L, I called McGaugheys and he told me there were numerous years with those numbers and the only way to tell the year was by the ball joints and tie rods fitting.

"Heavy Duty" means they take the 1.25" rotors, as opposed to the standard 1". Any parts store should have both for your year.