Hi,
I can get hold of calipers that bolt directly to the mk1 Golf/Rabbit hubs with either a 256, 280 or 305mm VAG disc, these will be much cheaper than buying VAG calipers and adapters to make them fit.
Drop me some PM's if you are interested, I would prefer to send a job lot to someone to save on shipping to make it cheaper for you guys!
Let me know
Ryan