Aha, looks like a can of worms.
http://www.clubgti.com/forum/showthread.php?t=77428well, technically you should have the correct ones...they look like mk2 ones to me (which should be the same as mk3 4 studs)
however, i'm sure i remember chrisP saying that its actually pot luck with mk3 4 studs....some have mk2 bushes, some have mk3 5 stud style ones.
i'd say you need the plus axle ones
I've got the PFR85-207 bushes (5 wheel stud axle), even though I have a 4 stud axle.
Some use the PFR85-206 bushes.
Dimensions are
Dia 63mm x 32mm long
Dia 45mm x 55mm long
making a total length of 87mm.
The bracket has a gap that's 100mm long.
Hole down the middle is approx 11mm diameter.