check with Direct Sheet Metal. I bought the floor kit for my 39 chev PU from them. The parts were good but designed to be welded in. I used their panels and trans tunnel to form my own removeable panels. I used 1/2" square tubing to make a perimeter frame for both the flat part and the toe board and then used their panels to cover the frame. It took alot of fitting and cutting time but my floor is still removeable.
If I was to do it again it would have just bought the trans tunnel and fabed the rest.