I'm not sure if you can still get that hanger from ford. If you do go to Ford tell than you need it for a 76 High boy. That truck is a high boy it has a narrower spring than other F250s. The rear isnt stock, Either it has longer studs with dual wheels or it is a cab chassis rear axle. The highboys have a 34" wide frame is the rear just like a cab chassis a 78-79 f250 or a 150 has a 38" wide frame. To figure out what kind of rear it is. Look in the web casting around the dif cover, It should say either 60 or 70. If it is a 60 then it is stick rear, ir 70 then swapped in cab chassis rear. Also if you cant find that, then look at the brake drums and wheel studs. Measure how wide the drums F250s had 2.5" wide drums duallys are wider. A 250 has a 1/2 stud a dually uses 9/16s. Either rear is possible. On a highboy, you can put duallys on with only a small spacer or just bolt in a whole new rear.
The front is a HD dana 44. The red hub is stock, the other hub is an external lockout from an old dodge od chevy. To swap this over you must change the hole hub (cast part that houses wheelbearings and attaches to rotor) to go from an internal to external or vice versa.
I have an old 76 Highboy for parts, I will check on that hanger and stuff for you.