BBS and Ronal are the two variants, I think, JJ. Why not ask the helpful chaps at Listers to look at the warranty claim history VW has on your car. that should show up if there were any previous claims.
Yes - BBS were the original suppliers of the Monza IIs, and these must ONLY use the metal bolt in valves. They were later replaced (around 2008) by Ronals, which have the bendy rubber snap-in valves. The two types really should not be mixed - get them to punch your VIN into ETKA - it will tell you exactly which wheels were factory fitted, and make sure they fit the correct ones.
And for the geeks, the BBS ones are the best, as they are lighter due to a 'hollow rim' technology.