The link of the mirror that you posted is the same one sold by most of the other vendors. It does have a stum on the back and it is the same one that is used with the upper bracket that is in my picture link.
The 1950 center post does not have the 5th hole. Does anyone know what the first year was for the center post with the 5th hole???? And if the mirror wasn't installed was there a blank-off screw that filled the hole????
Denny Graham
Sandwich, Il



Denny G
Sandwich, IL