I might swap them onto my 71 too,I haven't made up my mind though.
Here are 2 pic's of the mounting plate of the mirror.
this one's 3"5/8ths

this one's 2"1/8th
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension.
Petrolia,Ontario,Canada but working in Port Huron,MI.
See ALL my Blazer pic's HERE
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