My '48 came with big West coast style mirrors but it still had the original type mirror post style on the driver's side. I tossed the West coast mirrors and put a 5x7 mirror on that post.
I got another driver's side post from the junkyard and bent it (vise and hammer, surprised it didn't break) so it would be symmetrically located on the passenger side. You can see in the pics that it has a crook in it.
When driving, the passenger side door post blocks the view of that mirror but I don't care. I just wanted a bigger mirror on the driver's side and a symmetrical look.
34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.