Hello,
My '70 Challenger's rear speakers have been missing since I've owned the car. Now, I'd like to install a pair of 6"x9" speakers.

I have a package tray installed with speaker cutouts, but was wondering what type of fastener (metal screws or bolts?) is recommended to secure the speakers w/o puncturing through the package tray?

Thanks much for any info on how you guys have done this!