Convert from hub rotor assembly to separate parts?

The '73+ disk and drum spindle uses the same wheel bearings but pretty sure the cars earlier than that do not. @AndyF used the drum spindle with later 11.75" rotors and Gen1 Viper calipers.

This is what I did:

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Some tape and a hacksaw is all it took. I had a shop true up the edge just because, not sure it was really necessary.

But I am running a home built PBR caliper and 13" Mustang Cobra rotor BBK kit, not really a slam dunk for what you are looking for.