flooring (no carpet thank you)

[twohands]

i bought an old hauler with the floors rusted out and engine worke required, and now she is on the road, with floor pans and engine work behind me, but i am having trouble finding a source for a heavy-duty black 'pebble-grained' rubber (maybe 1/2" to 3/4"foam backing to soften noise and hot floor pans) and one-piece eliminating seams. i have seen such a thing in years past but i have no earthly idea for a current source. anybody out there got any ideas? i appreciate all input.

[bomber]

I had bought some a few years ago for my 83 GMC

JC Whitney I believe.