Without any photos to refererence and without any part numbers, your best bet is probably to look on ebay and see if you can find the right pipe because you can visually compare it to your car. Some of the ebay listings will give you the part number (eg 1K0820743AM) and then you can source one locally either via a VW dealer or get one from a wreckers. The Golf and Jetta are idential in many ways so as long as you find the correct part off another Golf or Jetta with the same 1.9TDI engine then it should fit.
If you do buy a 2nd hand pipe then best to replace o rings before you fit it to your car to reduce the chance of any leaks.
Refer some ebay examples below. Do any of these look correct?
VW GOLF MK5 AIR CON PIPE HOSE 1K0820743AM 1.9 TDI BKC ENGINE 03-08 | eBay
VW GOLF MK5 AIR CON PIPE HOSE A/C 1.9 TDI BXE ENGINE 2007 | eBay
VOLKSWAGEN JETTA MK5 AIR CON PIPE HOSE 1.9 TDI 2004-2009🌟 | eBay
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