When I refinished my fuel tank I ended up buying sheet rubber at the local “Hose and Rubber” - which is the only thing they deal in. I don’t remember what thickness I used but there was a thread on the forum about the recommended size.
It came in 3 feet wide sections and you then bought it by the inch. I then ended up cutting strips and adhering it to the tank. It seemed to work out well.
My vehicle had some rubber adhered to the frame rail that the tank sits on when I pulled it out. I don’t know if this was from the factory but I put new rubber back there also. My tank seems to fit fine with this rubber under it.
If your tank is out you might think about putting a anti rollover valve in the breather for safety. Most of the vendors sell them. Mine ended up costing $50.00.
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