Are you locked on to a Mustang tank? We used to use them but hate the idea of leaning over the tail gate to gas up and spilling gas on the nicely finished boards. The alcohol blended gas eventually messes up the coating on the bed boards. We now use S10 Blazer tanks that the filler tube is on the drivers side and run the tube up to a motorcycle gas cap in the left rear fender. These caps mount flush with the sheet metal and if painted body color they are nearly invisible, plus, it's right out in the open and spilled gas is not a problem. A few pics of one in a 52 short bed.

[img]https://i.postimg.cc/LYLk7BdX/003.jpg[/img]

[img]https://i.postimg.cc/MfG7TkMc/004.jpg[/img]

[img]https://i.postimg.cc/B8gP1YG2/016.jpg[/img]


Evan