[67chevy1series]

I'm backing livrat up on this one the third hole must be welded or bondo'd up they probably thought since the new mirrors would cover 2 holes they would save time possibly money by only filling one hole on both sides. And I also agree that the three screw mount with the arm is a 67-70 truck/blazer/suburban mirror. I had a 70 Chevy 4wd with those Mirriors from the factory. And IMO the 67-70 style mirror and mirror arm is much easier to see out of and does give the sw trucks a nice old school look and I don't think they look bad at all.