I thought the rear calipers were like slider 73 up calipers. Not the four piston KH 66-72 calipers.
I would think you could find a speciality place to reline the parking brake shoes if necessary (wouldn't think they'd wear much).
I know a couple people that have put them on 8 3/4 rears. You have to use green bearings and only used 4 of the 5 backing plate bolts. Also you machine the caliper adapters to move the caliper over some. I can't remember the amount but something under 3/8".
I though the disk were really hard to come up with??