Gef is gonna be the guy, one of the leaf spring pads has a bad location hole in it.4-1/2” BP 44” center to center on pads but photo shows bad locator hole.
I have one in Michigan if you are interested in traveling.
Complete w/ 3.23 open I would freshen it up before use -seals, bearings,gear lube, brake parts $200.
I can send pictures later if needed.
Those look like Duster / Valiant fronts
Plymouth has a more square front wheel opening than the Dodge counterparts ‘67 - ‘76 Dodge fender is tapered at the back.
13” sbp wheels are getting hard to find they have been getting tossed daily and have been for years.
Use what you have just get good rubber on them and remember drivers side lug nuts are LEFT HAND threads.
Ridhty is loosie one drivers side.
Bring it home safe.