Just finished my fog light retro using Blazer projector fogs from TRS. It was actually not too difficult at all. I used an 1 3/4" hole saw and a jig I made to make the holes in the back of the factory housings, just large enough for the projector lens to fit through. The chrome in the factory fogs didn't peel or flake at all, which I was worried about. The lens is just a little larger than 1 3/4" so I used my Dremel to size the hole perfectly. I used JB Weld to glue them together.
No night shots yet because I still don't have my complete 880 HID kit from TRS, I am missing a part. I will certainly get some night shots as soon as possible. I have the halogen bulbs in there now just so I could get them aimed. I managed to get them horizontally level just using reference marks on both lights before I glued them together.
They fit into the bumper with zero modifications, and the factory adjusters still work perfectly. These would just pop right into any Gen II Taco. The Blazers are surprisingly small and light-weight, and they have a great cut-off line like a projector should. The entire body of the Blazer is out in the open so they should run nice and cool.
You can't even tell they are projectors unless you get up close, they still look mostly factory.