The rear disc brake parts are any EA82 Turbo or XT6 for pads and calipers. Rotors would be depending on 4-lug = EA82T, 5-lug = XT6.
As for the speedometer still not working, cable may not be fully engaged at the dash still.
I have not pulled one from a trans as of yet, but in this case I think I would do so. Then attach a cordless drill to that end and spin the cable, probably have to run drill in reverse. Have helper see if speedometer moves. Try pushing cable housing onto dash attachment more if it doesn't.
Cable is removable from the outer housing, but again, I can't say for sure on which end it pulls out of.