Classic Industries OER front conversion question

Pshas192 said
I am perplexed, my 1972 Duster 340 has manual drum brakes and I want to convert to 11.75 discs following the (disco-tech) system.
I bought the QA1 tubular upper control arms and adjustable strut rods.
I'm keeping the lower control arms. They are refurbed / boxed with Delrin bushings.
Do I need to back up and get big ball joint uppers? Can I continue with the QA1 tubular uppers that I have?
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You need large ball joint upper control arms, or adaptors, if you want to run the 73+ spindles you need for the 11.75’s. If you bought small ball joint QA1’s you need ball joint adapters. Or send them back for exchange. QA1 makes both small and large ball joint uppers, so it depends on what you bought.