I had a Ford that I installed factory cab lights on and really liked them. I just traded it for my new Duramax and am a very happy camper. I want to install factory cab lights on this one, too. Anybody else here done it and have the exact measurements?? I have the OnStar and the XM radio ant's to be worried about so I need to be pretty close.

look in the how too section.... good article with measurements..I belive Topgas did it?