[CC69Rat]

I put one in my 68, without any trim at all. I used an industrial grade velcro. You can buy it in a roll, I think it's 2" wide. It fits perfectly in the lower indentations in the roof of the cab. Of course pressure sensitive adhesive. .. stick one side to the roof and get the pieces all in place like you want them. Test fit.. etc.. then pull rhe backing and press your headliner up.

The adhesive on the velcro is a one-shot deal. Once it's up, it's up.. definitely not going to just fall out. It stayed up very nicely in my truck and looks really clean without the trim surround. No drilling.. check it out. It works. I'll see if I can find a picture of it.