Depending on your year, the mirrors were round or square, but I believe they all had a three screw mount with backing plateThe mounting holes were not all horizontal.......more like 9, 3, and 7 of a clock face.
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'72 K5 CST 350/350 Daily Driver
'69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck
'69 GMC 2500 L6292, 3spd beater
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