Bought some from J.C. Whitney some years ago. It was shipped by the manufacturer direct to me. Their name was on the box. Called them and bought direct after that. They had different grades and thicknesses. Did a 359 with it and it was like a Cadillac. If i find the No. i'll post it.
get dyna mat, used it on several pick ups, both dumps, got in a tree spade and a wheel loader. Works great. Thinking of putting under head liner in my dodge to help keep it cool