The link I gave sells linoleum for use in restorations. They have the correct thickness in the brown/tan color. It is sold in flat, non-grooved sheets/rolls. Unfortunately, they do not have available a black linoleum, the color of the 54/55 Suburbans' rear-floor "mat". The linoleum in Advance-Design Suburbans was glued to a plywood floor.
The owner of Battleship Linoleum will send you samples and a very well-written article on how the lines/grooves (patterns) may be put into the linoleum using a home-made jig and a router.
Tim
