i got a class 4 one that was almost new off my cousin's 72 ford 1/2 truck, he didn't want it any more, is was a perfect fit for my 63 gmc k10. so if you look around and find one for that 70's vintage ford it should be the same for yours
1949 Chevy 3600 Flatbed all orginal 1964 gmc 4000 1973 gmc 6000 2005 chevy duramax 4x4 1994 chevy 1500 Trucks are GM and Tractors are Orange
"I don't measure a man's success by how high he climbs but how high he bounces when he hits bottom." - General George S. Patton