When we first started the project we ripped the floor out of our van with the intention of replacing the whole thing. I soon discovered that no one manufactured a replacement floor for a 1971 model. I had been looking everywhere for a fix for my problem and finally I found http://www.klassicfab.com.
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They make this great one-piece replace floor and as you can see it fits very nicely.
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I love the days when new parts show up, it like having a birthday in the shop.