It was a strange time in driveline fitting. In 97-99 Ford sold a "Lite Duty" F250 which was badged as a 250 but looked like the 10th gen 150s, they all had 7 lug wheels. Ford did not have the Super Duty F250s ready until later in 99, when the SD250s came out they discontinued the LD250s that looked like 150s. During the same period of time, Ford sold 150s with basically the same running gear as the LD250s but with 5 lug wheels.