Description There were two types of fuel tank straps on 1st Gens: Bolt in – This style was used from 1981-1990 and was a threaded rod on the driveshaft side, and it would bolt into the frame/crossmember on the framerail side. Hook In T slot – This style was used on 1991-1993 trucks and has a threaded rod on the driveshaft side, and would hook into a T slot on the frame rail side. This is for the T slot hook in style and is used on both gas and Cummins diesel trucks. These do not fit Ramchargers. Will fit 150-350.