I have seen some people use the Aero fuel tanks, for the mid 70’s F250 4x4, (HighBoy) installed behind the axle and between the frame rails. There have been some complications with the filler neck angle or how it fits, I’ve read a few articles on this topic! I contacted Aero concerning, they...

Looks like I'm unable to find determine how many of these were made. According to the vin plate it was built for the government.