Good afternoon everyone
The VW part numbers for the rear calliper hoses are as follows (they are one piece flexi. assembly with integral rigid pipe attached):
NSR= 6X0 611 763 C
OSR= 6X0 611 764 D
From what I can work out, there is currently no option on sources for a standard spec. hose for a GTi other than through the dealer/TPS network, hopefully this will change in the future
Martin.