I was wanting to do a 3rd brake light mod but before i tear this apart i would like to know if any one has done this (using pontiac or firebird logo) as your 3rd brake light?

check the tech articles and run a search, i'm positive a couple people have fabricated plates to place over their third brake lights to illuminate Pontiac or Chevy or something like that

I checked the tech articals but the only thing they show is a 3rd brake light in a wing, mine is in the top of the back window which the size is a differant shape.