Help! I need to identify my upper control arms please! 70 dart.

SMALL BOLT PATTERN ROTORS, for the 73-76 A body cars?
6 cylinder Drum brake car?
Why in the world would you want anything like that?
I haven't heard of that at all, till you just brought it up.
Ok then, who has them, who do you get them from?
Not to go off track, from the original posters question(s).
https://www.doctordiff.com/10.95-front-disc-brake-kit.htmlif you run thru the pull down options it'll give 5X4 on a plain rotor

i *think* MBM and pirate jack might also offer them.

the only reason i can see is to retain sbp wheels. like if you got really nice cragars or some vintage keystones, or if you just put new rubber on.