I have a 57 short step that I put a 66-68 Mustang tank in. It's a 16 gal that fills through a trap door in the bed.The tank falls between the frame rails like it was meant to be there. I fabricated a crossmember in the front of the tank and two pieces of angle iron for the sides. The rear frame crossmember was removed and then reinstalled upside down and became the rear mount for the tank. In case of a leak the whole thing will slip out the back without removing the bed. I extended the filler neck with a piece from Speedway and did it all for under a c note. The tank looks good from behind unlike some of the catalog tanks that look like suitcases hanging there. Good luck
Richie Z
