Hi, If you get a straight edge and put it across your wheel arches say (150mm ish down from the top of the arch), and measure back to your tyre you should find that around 25mm(or 30mm) on the fronts, and upto 40mm on the rear. I went for 25mm all round on 235 tyres,
It really is worth getting some good hub-centric TUV approved spacers, I went for HR, but there are others.
Just think about your bolts, their heads and re-using your plastic body head covers. It is hard to find 19mm bolt heads with the correct seating, and a VW wobble collar. If you don't have those, re-using your covers is tricky (if you are even bothered). With the larger (thicker) spacers you can reuse your old bolt, as the spacer bolts to the hub using supplied countersunk bolt heads. Then your wheel bolts to hub(cast in inserts to take bolts). For the 30mm+ fine, for 25mm spacers you may ned to cut a couple of mm of your existing bolts' thread, if you wish to use them. I think you will be pleased with the look. It is a big big improvement. Just be mindful going around left hand corners; you will probably clip the kerb, to start with.