I have bought a Hayman Reese towbar without the wiring harness and ECU because I am planning on using the genuine harness to complete the setup on my 2011 147 Tiguan (7spd DSG). I was quoted $450 by a local VW dealer for supply of the harness, but have a few questions:

What is the part number for the towbar wiring harness?
Can I source the part overseas at a cheaper price, like the u.s. for example, or is it an AU specific part?
Does the wiring harness come with everything I require to complete the electrical side of the install? (I have a vag-com cable to complete the ECU side of things).

Thanks for your help!
-Anthony