OEM-type floor padding?

[Stocker]

I recently had to remove the original floor pad material -- a thin lightweight white foam against the floor, topped by a thicker, heavy, dark material that I guess must be sound deadener / heat barrier. They're both in pretty rough shape and I'd like to replace them.... but what with? It's just a rough work truck and I don't need anything fancy or expensive, just something to go under a rubber mat. Is the OEM type padding still available? Or is there something better out there? Thanks guys.