I would say that a search on vwvortex.com forums would easily bring up before/after spacer pics, but since the forum software changed over it's kind of hit or miss. Lots of companies sell spacers. You need to make sure they are hubcentric, with a 57.1mm centerbore, and that your new lug bolts are the correct (longer) length.
http://www.hrsprings.com/products/trak/
I had H & R's for my jetta for a while. They really give the car a meaner stance. Good quality product.
http://store.blackforestindustries.com/wheels4.html
These guys also have a full catalog of wheel spacers for Mk4s.
Once you get the rear lowered, you could measure the tire to fender edge offset at the front and rear and get a set of spacers to eliminate it. Note: wheel spacers add load to the wheel bearings (potential premature wear) and increase likelihood of rubbing your fender at full lock or hard cornering. If you are all about style though, these are minor concerns. haha. It does look like at least your rear wheels could really benefit visually from some spacing.
Nice beetle! I like seeing lowered new beetles, they are not too common. Do you know your wheel/tire specs?
