Got some pics of the part? You can look up the parts at a number of online VW dealer parts sources; one is VW Parts | Volkswagen Parts, among many others out there.
I don't know your exact part but some parts are sold as parts of whole "assemblies" (thus you have to buy the whole assembly; which many times is not cost effective, you just need the single part replaced); sometimes, you can get hydraulic type parts from places that repair/make hydraulic hoses for industry (e.g. farm equipment, diesel trucks, heavy industry moving equipment etc.). Search in your local phone book for: "hydraulic hoses" or "hydraulic repair" etc.
You might search the above online dealers or post up a picture of the part and where it is, maybe we can help!?
I think this diagram and exploded view; has the banjo bolts that you are referring to: (this particular company; lists the volkswagen part #'s so you can check them out at your local dealer, always give you vin # to confirm you are getting the right parts for your specific car)