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I lined mine up pre drilled the holes. Hit each hole with a squirt of primer. Once dry put a good amount of silicone around the hole and re installed the visor so the silicone made a seal to protect from water entering cab.
Just take a few self tapping screws to it. It's not going to kill it. I do the exact same thing that Midnite 1987 does. When people put them on and don't do anything to it in the form of protecting the bare metal, then you end up with a rotten roof like Puddy warned against.
Rot is NOT an issue if done correctly. I have been installing them for the past 20 years and YET to have a rust issue.
What i do is TAPE the visor in place and look it over real good making sure it is centered and not too high or too low.
Take a sharpie and mark all 8 holes.
Remove visor
Drill all 8 holes with 1/8" drill bit AND BLOW ALL METAL SHAVINGS OFF
Put dab of silicone on all 8 holes
Tape visor back in place.
COVER screw threads with silicone and install screws LOOSLY one at a time.
When you have them all in, GENTLY tighten them. Remember you are threading into sheet metal so dont get carried away. Wipe excess silicone off of visor and roof
Doing this will guarantee MANY years of RUST FREE/LEAK FREE years
I pre drill a small hole and then use self tapping screws. And then back out the screw and silicone it and put the screw back in. I did that to my 95 when i bought it new and when i pulled the visor off last year when my truck was wrecked there wad no rust, and i live in the rust belt
I didn’t use self tappers for mine I lined it up marked the holes and put rivet nuts in there so they have better hold then self tappers and the I just used dummy tape over everything for a seal and I took my truck to the car wash the next day and I didn’t notice any leaks
I lined it up with tape and marked all the holes, then drilled them with a stepper bit and used rivet nuts on mine. Stainless nuts, and stainless screws to go with. I also put a dab of silicon on the rivet nut before I put it in, and a bit on the screw as well. I have not had any issues with leaks or anything coming loose.