I didint use adhesive for teh wal mart pads. THe back seat pad is holding them in. It is a tight enough compression that you wouldn't need it. They are 12 x 12 squares , maybe 16 by 16. Either way, you have to cut them here and there to get them to fit. That wal mart stuff is open cell.
Th closed cell foam I got from Hanna Rubber in Kansas City. THey will put PSA on anything. They have a machine that applies it and you just pay a little extra for the application.

Sold Truck: 89 DLX extra cab 4x4 22re Automatic/ New truck 97 T100 4x4 auto Sr5