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funny i happened to find this now. i just posted in the exterior forum. why do you need to mount with the side screw? i remember looking at mine from underneath the car and thinking i could unbolt the housings, take the bulbs out go from there.I just upgraded my '95 MkIV with modified OEM clear turn signals. The modification was to remove the amber reflector/lens inside (I wanted the totally clear look, as opposed to the "fried egg" look), which are attached with a single screw.
But, to get to that screw, you have to remove the clear lens by baking the whole thing in the oven first. I baked mine at 270 degrees for 11 minutes, pried the clear lens off, quickly unscrewed the amber reflector, and compressed the clear lens back in place.
I wired mine with a variation of the instructions in this thread. I decided to go with both new (part of the new turn signals) and old (inside the headlights) parking lights lit together. It was a simple tap-in to the existing parking light wire. I used "Posi-Taps", which are much better than vampire taps.
Thanks to greggf's excellent solution for the side mounting screws. I didn't want to cut a long slot in my bumper, and I've seen some of these turn signals look droppy without the side screw attached. The only problem is that, on the OEM 97+ turn signals, the side screws don't screw out! They appear to be aluminum studs that are pressed into the plastic housing. To get them out, I heated up the stud with a grill lighter (which softened the plastic housing) and pulled them straight out. The hole I had to drill in the bumper had to be 1/2 inch. When I reassembled them from the inside of the bumper, I had to heat the stud (with the grill lighter again) for about a minute and then re-pressed it into the housing. Since it was hot, it softened the plastic housing as I pressed (holding it with pliers). I waited a few minutes for it to cool/seal, and then put on the fender washer/nut that came with the new lights.
i'm more curious as to the wiring an LED in there though. assuming you go for one that's clear and lights up orange, what do you have to do special to make this work? what are "posi-taps" and where did you tap?