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Here are the rear calipers & pads from O'Reilly:

BrakeBest Brake Caliper - Remanufactured
Line: BHH | Part # 184842

BrakeBest Metallic Disc Brake Pads
Line: BB2 | Part # MKD224

The key to finding the calipers was the casting number "472". The brake line fitting is 7/16-24 like the original. I'm replacing the brake lines as they were quite rusty.

The torque multiplier tool is the best. Got one on Amazon for $55. China of course but it does work great. Had to buy a socket for the large lug nuts. I think it was 42mm-1" drive. Didn't come with the tool set.

I ended up getting a DEWALT DCF899B 20v MAX with up to 700 ft-lbs of max torque and 1200 ft-lbs of max breakaway torque.

But the problem had on the inner wheels was they have reverse threads. Opps. Once I figured that out it was easy.