i recently put these fog lights in my 04 grand prix gt with tin flashing...i took a little piece and stuck it behind the factory fog light hole and drew the circle of the fog light hole...then marked where the factory hangers are for the factory fog lights to put holes in the flashing where bolts were used to hold it in place..i then placed the halo fog lights somewhat centered in the hole that i drew from the factory fog lights and traced them but i didnt cut the exact circle from the halo fog lights so the outer lip on the halo fog lights would catch the flashing and not pull through..i cut the circle out for the halo lights except for a two little square tabs located in line horizontally with the factory hanger holes which can be bent back and have holes drilled in them to screw the halo fog light brackets to..i also sanded the flashing to give it a brushed aluminum look which was very nice..let me know if you have questions or want pictures!!
