1964 Plymouth valiant driver side mirror and arm rests

You need a 1964-66 remote mirror. The holes are smaller because they only needed to accommodate the cables which were manually attached to the mirror. 1967 and later mirrors were one piece and the holes were larger to accommodate the adjustment piece. I think I have a earlier one. I'll get pictures tomorrow.

You could use a 1967 and later mirrors but you'd have to enlarge the holes.