Did some more then I ran out of roof. When I got my truck it did'nt have a linner so I don't know what to do. In need to ancor the plates to sonthing. I was thinking some kind of arched metal brace. I don't want it to rattle though.

Maybe every 5 inches or so? It looks like the old liner was foam glued to the roof? Are a dogs balls round or pear shaped ? So many ??