Yol Seb

If you purchase or get a hold of the rear backing plates / brake disc cover plate for a Subaru SVX, they will allow the mounting of the 2 pot rear brakes on to the small R160 rear uprights.

I think the handbrake shoes,etc will be the small type as well.. so you can use same hand brake stuff.

It's possible the whole rear upright from a SVX might be the same as GC8 impreza... not 100% sure, but I done the mod for a rally car running R160 diff.

Cheers
Stona