Everything adam says is spot on!
Just buying adjustable links will NOT solve rubbing issues with a standard arb in most cases, especially if your running around -50mm.
I dont now why they sell adjustables longer then the standard links
Its the same setup as my golf mk4 which i just went through everything adam has just said he tried.
Only way i full solved it was an FK arb and cut down adjustable links.
Take a look at this link an you see my cut down links and how they move the arb forward bringing the bigger loop further over the driveshaft.
http://uk-mkivs.net/forums/t/359585.aspx