im not sure they ever came factory as 4x108. Your best bet is to look for the corvette pattern that can be had very cheaply and run adapters, otherwise getting them filled/drilled is a spendy proposition and i'd hate to see someone ruin a set of good 4x100 RS's
check the vortex, or any other large scale VW/Euro forum such as Eurowerks.org (more midwest based, but there are many national members and a ton of wheel whores on there that buy/sell/trade BBS wheels like they are PEZ)