Under Bed Gas Tank Suggestions

[71stub]

I'm working on a budget truck and would like to find a stock gas tank from a salvage yard that fits between the frame rails well on a 1957 shortbed behind the axle. I tried one from a Bronco 2 and it fits between the rails nicely but hangs way too low and only has a couple of inches clearance on my lowered truck. It is the 23 gallon tank and is the only tank that I have found online for them but read somewhere that they work well on these trucks. Maybe if you have a 4WD and dont mind the tank hanging well below the roll pan/bumper. Any help is greatly appreciated. Thanks.