Early Discs? Not mine on CL

"They were pulled off my 1974 Challenger project"
maybe F-Body?
FYI
Don't you just love it when somebody interferes with your ad, your posting, when they don't know what the F they're talking about in a reply.
You have your parts listed accurately.
1970 -72 B & E body disc brakes used the smaller diameter inner wheel bearing that you advertised correctly about your spindles.
You have pin type caliper brackets, so they were used on the 70 74 E body's, and 70 72 B body's.
You DO NOT have "F" body brakes.
Those have a different machined, styled, spindle, than B or E body ones.
You know what your looking at, once you've been around the cars for decades.
And the 73-76 A body car, disc brakes, used "Slider Type" calipers, which you don't have in your pictures.