Best Upper a arms for 72 a body

7duce swinger said

So the qa1 #52301 would in fact work with that specific dr diff kit. I just want to make sure before i buy some and have to return them lol.

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It should. That’s the part # for the 73-76 QA1 UCA’s, which are large ball joint UCA’s. And the 11.75” brake kit uses 73+ spindles, which take large ball joint arms. Beyond that all you could do is call QA1 to confirm they’re the large ball joint arms, but that’s what the website says. Or call Cass (DoctorDiff), but that’s a stock Mopar parts brake kit so the spindles have to be 73+.