Maybe kinda tough to see, but I put '70 mirrors (R&L, driver remote) on my '69 in '75. Other mods (which fortunately for the car never happened) were planned aftermarket "T" tops (the rage in mid '70's, mfg. by Hurst and others), custom grille with square headlights, black paint with gold highlights/panels; I did install an in-dash AM/FM CB, plus a column mount Sun Super tach. Removed the console, installed a Mr. Gasket Pro Shifter, recarpeted with fuzzy shag black carpet. I was proud of it, still am considering I should be shot for what I did to it, or for what I wanted to do to it - at least most of the car made it this far fairly intact.
In 1979/80, I learned what the X77 stood for on the cowl tag, so mods ceased and recovery began - still at it all these years later.