Ozscott, When I had my '66 C10, I cut a piece of lauan(thin wood paneling)then covered it with 1/2" foam rubber and covered that w/headliner material to match my int. cut out to fit the same profile as my roof and gluded and screwed it to my overhead. Worked great cut out the sound and heat also looked great. I also recessed and cut out a bowtie in the foam sorta 3d affect. Good luck
