For a while I used a modern Chev pickup tank that mounted inboard of the frame, (some pickups have two of these one on each side) worked great as long as you can rig up a filler neck. Not what you asked for but worked great for me.

Last edited by JiMerit Boltr#43; 03/21/2019 8:44 PM.
It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed