1973 Duster 340 Clone, Whats it Worth

The '72+ markers wouldn't be all that hard, and they would appear as "natural" as the stock ones did. They also cover quite a bit more area than the hole, so as long as it wasn't totally botched the marker should cover any flaws. Plus, they'd be "correct" for the inspection.

Easiest would be the little markers off a '68. But I don't know if that would be good enough for your inspection.

The '68 Side Markers would be fine for passing PA State Inspection.

PA doesn't give a crap if the parts are original (or even for a Mopar, he could use ford lights and they wouldn't care) as long as they function properly.

The only time he would have to worry about originality, is if he wanted to tag it as a Classic/Antique vehicle. Those applications go through a screening, sometimes they nitpick, other times they don't notice mods