11 3/4 rotors

BigBlockMopar said

With the C-body rotors you also need the C-body calipers.
I've made some spindle collars from a close-fitting piece of pipe-tubing at the time but I recently found the tubing material was too soft and deformed a bit after time. I'm currently redoing the collars by machining 2 cam lifters which are made of a better material.

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I don't think the PO was trying to use C body rotors, just got them by mistake. Easiest thing to do is just use B/R body rotors with the calipers he already has.

Dr. Diff sells wheel bearing collars, I wouldn't be making those myself. C body rotors require a bit of custom work to make them fit, and there really isn't an advantage to running them vs. the ones that bolt on.