Backing plate nut and bolt

I am looking for a backing plate nut and bolt for my 1972 Plymouth Duster 340. Therte are 4 total but the one I want is completely different than the other 3. It is the one on the bottom and toward the rear of the car. The reason I need it is that the nut is thinner to avoid hitting the self adjuster cable. The nut and bolt are somewhat stripped out and I don't want anything bad to happen. (I know there are 3 more but I worry) Could someone help me find a couple?

ALL the Duster 340 cars had the 8.75 axle didn't they? This axle used 5 bolts to retain the axle AND the backing plate. I'm not quite sure I fully understand your question... More info or pictures would help.
MAYBE you are asking about the FRONT brakes? You didn't specify.

Has to be the front , all the studs and nuts are the same , and 5 total , on the rear .

napa in the Dorman fastner line

moser has them if its for the 8 3/4 rear axle

sorry, I forgot to mention it is on the front drum brakes. it is the lower rear bolt and nut to the backing plate. the nut is pretty thin to avoid interference w/ the brake shoe.

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sorry, I forgot to mention it is on the front drum brakes. it is the lower rear bolt and nut to the backing plate. the nut is pretty thin to avoid interference w/ the brake shoe.

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You will probably need to put a want ad in the A body parts section , that's not something you would find new in the correct configuration. And don't drive the car till you get it , that bolt is also holding the ball joint to the spindle.