I can use the rear 256mm discs and calipers and carriers off a 2004 Toledo as an upgrade for rear brakes on my VRS?

Already have the 312mm upgrade on the front.

cheers.

Edited 13 December, 201114 yr by trebormint

Should work, and being a FWD car you won't need to get spacers made up as you would with S3 rears.

Yes no problems assuming they are from. V5.