ive been offered some gti calipers (16V 239mm) would i be able to fit these stright away with uprated disks and pads then
NTR477DG Nitrac Drilled + Grooved Discs Golf Mk2 GTi 1.8 16v 8/88>7/92 £125.52 £112.9
TRX-0221S Tarox Discs - Sport Japan - Front Golf Mk2 1.8 GTi 16V 10/88>91 £157.45
bearing in mind my car has no ABS
you sure theyre 239's? Would depend on what year 16v they came of wheter they are 239 or 256's. After 8/88 16v's came with the larger discs, and to use these you need later spec 16v hubs. The discs and pads youve put up WONT fit a car that originally had 239mm brakes but your cvalipers might fit your car (caliper year dependant). If you dont know the size of brake the caliper is for just stick with 8v calipers, as the are all 239's.
oh, and no mk2's had abs iirc, makes it more fun when you lower it and dont change the bias as rear wheels lock up first

hope that helps.