K5 roofs are 2 layer, what I would do is leave your headliner in place, mark where you want to screw the mounting bracket in, drill you two small holes where you marked, then screw the bracket in with some 1/2 to 3/4 inch sheetmetal screws. Then pop a small hole in your headliner and run the power wires and coax up through it so they are hidden, then run them down the A pillar. I want to eventually mount my cb up there. I have a Cobra 29 right now, currently its mounted to the tranny hump, ill post a pic tomorrow. I made a taller mounting bracket for it that way I could get the radio at an angle where I can see the faceplate. I like it where it is but eventually I'd like to move it to the roof, at the time when I installed it I just didn't feel like rerouting all my wires to the roof, because I already had the perfect length coax and power wire from the fusebox laying in the floor from my old CB.
