So to be clear, the spindle and bearing would be inside/behind the hub, correct? Before I go dismantling the whole thing…
Correct. I doubt anything happened to the spindle and the bearing. You'll have a great opportunity to inspect when you replace the rotor as it has to come off.
Rotor is common, our part# BRR60100
Unfortunately the LH backing plate (47704-60070) is NLA though just recently so you may have some luck there.