The parts list for the genuine bike rack starts on the following page after the part number for the rack itself which is 7h0071104
Non locking plastic nut to tighten the clamps https://www.lllparts.co.uk/en/product/tensioning-nut/mpn/1J0071735
3x locking plastic nuts to tighten the clamps https://www.lllparts.co.uk/product/toggle-bolt/mpn/7D4071734
Straps to tie the wheels down with, they are 16mm wide and I have not been able to find an alternative https://www.lllparts.co.uk/en/product/tensioning-strap/mpn/1H0071740
Tail gate clamp kit left https://www.lllparts.co.uk/product/clamp/mpn/7H0071778UL
Tail gate clamp kit right https://www.lllparts.co.uk/product/clamp/mpn/7H0071778UR
Bike to Bike clamp for the 4th bike https://www.lllparts.co.uk/product/wheel-and-spacer-holder/mpn/7D4071746
Protective stickers for tailgate Paint Protection Pads for Bicycle Carrier VW T5 Built 2003 - 2015, Self Adhesive Clear Protector Pad, Pack of 7 : Amazon.co.uk: Automotive
Hope that's of help to someone
Source for some parts but seems expensive overall: BIKE RACKS, ROOF BARS & ACCESSORIES
Non locking plastic nut to tighten the clamps https://www.lllparts.co.uk/en/product/tensioning-nut/mpn/1J0071735
3x locking plastic nuts to tighten the clamps https://www.lllparts.co.uk/product/toggle-bolt/mpn/7D4071734
Straps to tie the wheels down with, they are 16mm wide and I have not been able to find an alternative https://www.lllparts.co.uk/en/product/tensioning-strap/mpn/1H0071740
Tail gate clamp kit left https://www.lllparts.co.uk/product/clamp/mpn/7H0071778UL
Tail gate clamp kit right https://www.lllparts.co.uk/product/clamp/mpn/7H0071778UR
Bike to Bike clamp for the 4th bike https://www.lllparts.co.uk/product/wheel-and-spacer-holder/mpn/7D4071746
Protective stickers for tailgate Paint Protection Pads for Bicycle Carrier VW T5 Built 2003 - 2015, Self Adhesive Clear Protector Pad, Pack of 7 : Amazon.co.uk: Automotive
Hope that's of help to someone
Source for some parts but seems expensive overall: BIKE RACKS, ROOF BARS & ACCESSORIES