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Since you asked How,...not where. The easiest I have found are #10 Stainless Tapered Phillip Head Marine screws. Place the mirrors where you want them, then drill the holes-all the way through- then put RED LOCTITE on the screws and Screw them in. Don't move the mirror at all for 24 hours. If you do them this way the screws wont come loose on their own!
NOW.... IF, you want them to be functional install 3" Fisheye Mirrors right over the factory installed mirrors. Believe it or not it only takes about a half hours drive that you get accustomed to the Fisheye Look AND you will actually be able to see to the rear!
DV
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