theres no law against it, but there are laws against increasing the width, diameter of your wheels, and also on increasing the track width of the car. check teh ADRs. should be available fron vicroads website
i'll just egg each panel, and you wont have to colourmatch. although, going by your efforts on the r32 you'd have trouble regardless of the type of paint on the golf
no they will sit 10mm away from the hubs/ further out towards the guards. not enough to hit anything though. they sit quite nicely. there are plenty of pics on the net if you can find them. in fact i think some guys on ns or here was selling a set and had them fitteed to his mate's white r33