mk3 1.8-2.0 8v petrol gearbox will fit straight on, as will mk2 16v. but with the 16v and 21.0 8v box you need a 16v clutch kit. the flanges on 1.8 MK2 and 1.8-2.0 MK3 petrol models are all the same size, so no need to touch em. its the 1.6 petrol ones that have 90mm flanges on