If you can round up the parts, the best thing to do is swap for the later stainless trim. You will have to also use the later rubber gaskets and clips, and drill holes for the clips.
Switching was easier 25 years ago when I converted mine because you could still find what you needed in the local junkyard.
Front is easier, because the stainless trim and gasket from any non-Duster type A body hardtop (and maybe sedans, too, I don't know) 1968 through 1976 will fit. For the rear, you're limited to 68-9 fastback Barracuda.
