package tray install help

I have a 74 Duster and bought a new package shelf with speaker cutouts last year at Carlisle. When I went to install it noticed it was too long. I cut it down to size and installed it. I called REM about it and there are 2 different sizes, 1 for material headliner and 1 for the plastic side panels which are thicker hence the narrower shelf. He offered me the edging to dress it up but I did such a good job said I didn't need it. It as very nice of him to offer the edging at no cost.