i went to my fatherinlaws salvage and just started trying pickup mirrors till i found something that looked right and fit the doors. [handy haveing that salvage around!]
seems like they are 73-79 f150 mirrors.
if you want the small round ones, find something that is close and drill a couple of holes.
dont try the peep mirrors, sometimes call hotrod mirrors. you cant see squat out of them. course they do look good!
jim