Use the part number highlighting and order from TPS or your local dealer.
You will need a repair wire which comes with a terminal at each end, cut it in half then you will have a repair wire for each side. Extend this wire (use hermetically sealed ferrule) and run the wires to the left rear roof area to access the wires to connect into.
So 2x 1J0 973 733 Terminal Housing
1x Repair Wire 000 979 133 E (1.0mm) cut in half and fit blue seal. Insert into pin 2 on each terminal housing. Lock the purple clip into place once all the wires have been inserted or it won’t fit the light connector.
2x wire seals 06A 972 741 D (blue)
2x repair ferrules 000 979 941 (red NB heat the sleeve with hot air gun to shrink, make sure even heat to seal correctly, glue should come out of each end slightly, but don’t overheat. Using a lighter is just gash).
Or I could price it all up for you tomorrow and make them for you. I would use a single wire rather than having the join, you would just need to de pin the wires from your van and insert into the housing.
You are going for the factory look, remove all the original loom tape to the rubber bung, feed your new yellow repair wire through the grommet (and into the van) then tape it up with the other original wires keeping it the same without bunching with fresh good quality tape. Notice to tape over the rubber grommet to keep the water out. Leave some wires free of tape close to the plug to keep some flexibility.