288`s have a different mounting location and as such wil not fit you need the g60 caliper as fitted to these models
mk3 gti, some passats, ibiza 2.0 gtis, corrado g60 - girling caliper 54mm piston (vw pn vw part number 357 615 123 & 357 615 124)
basially if your looking for 2nd hand calipers aim for early mk3 gtis, look out for girling 54 and the 2 indentations on the caliper knuckle, the carriers should also fit a mk2 16v hub
some early vr6 golfs had 280s and later changed to 288 - not sure if teh poverty spec gtis followed suit.
new calipers are about £50 each i am sure