A friend works at a rock quarry. The generate a LOT of used heavy conveyor belt. If one part tears, apparently the whole chunk goes on the scrap pile.
He brought us a good chunk, we pressure washed it, used a cardboard template in the cab to cut it, and now it's a nice heavy floor mat in my 1984 International S2500 dump truck. Really quieted down the tranny and road noise.
FYI