If you are wanting to stay stock, it is the cloth type you speak of. There is a wire that runs down the centre groove and wraps around screws at each end to tension it.( I think....I didn't actually install on my truck - I opted for self adhesive foam type as my truck isn't stock ) Try Jim Carter Truck Parts and Chev's of the 40's as alternate suppliers.


1940 Chevy KC 1/2-Ton
In the Stovebolt Gallery