yes you need at least a mk3 subframe (any model will do, some seats have the one you need too) for the rear engine mount, mk3 rack with mk2 narrowtrack track rods bones, shafts etc. main issue is sourcing the front crossmember as you need a corrado VR6 one, mk3 wont fit. Might be able to customise a front engine mount to work though. the MK2 radiator support half of the crossmember can be retained, or you can use a rado vr one.
4stud hubs on 5 stud wishbones dont work well as the wheel ends up off centre in the arch, there was a thread on the vortex showing the balljoint mounting ended up 5mm or so forward or back. MK3 4 stud or Passat 4 stud widetrack wishbones, track rods n shafts would work, or you could just go 5 stud.
Going 5 stud means you need a different anti-roll bar, no prob if you haver the whole setup but not so good if you already have an uprated eibach set or something, a MK3/Passat 4 stud widetrack setup will work with a MK2 anti roll bar
