Help with a 68 GTO Tempest Lemans Standard Driver-side Mirror GM 9787901
On my 68, I think I have the original standard mirror but the chrome is starting to pit, the mirror head is somewhat loose and I'd like to replace it. I believe it's a GM mirror but I am not 100% sure. I hear the cost of rechroming and reconditioning these things far exceeds what it is worth. I'd like an NOS, but a better original or repro with the correct shape is more in my budget.
This is what I have. Under the base are 2 surfaces that have part numbers - on one surface is "15 1548" and on the opposite surface is "N3". The date code on the mirror glass is "5-AX-7", and if I understand the numbers this would indicate May 1967. My car's invoice date is Nov 1967.
My Pontiac master parts book (July 1, 1969) says the following:
67-68 Tempest 6/8 cyl, Pontiac full-size 8cyl, Firebird 6/8 cyl (round), except remote, P/N = 9787901.
The issue that I'm running into is when I buy a repro, the profile of the chrome dish behind the mirror glass looks quite different than mine. My chrome dish is more smoother (1st picture), where the repops have a noticeable ridge about an inch away from the outer edge (2nd picture). Can anyone confirm if I have a correct original GM mirror? If I decide to go NOS, I see NOS mirrors on ebay all the time but I suspect that some sellers might be selling a repop in a GM box. I just want to know before I buy.
Thanks for the help!