It is the same as Chevrolet for 1957. The material is readily available and is reproduced. Get on the net and contact people like C.A.R.S. In Michigan. They sell complete interiors, but they may sell you material by the yard for you own use, I am not sure. It is worth a try. By the way there are other manufactures of original interior material, their names just slip me right now. George.
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1957 Pontiac Pathfinder Deluxe sedan restored 261 six
1974 Chevrolet Caprice Estate wagon low mileage original 400 V-8