First I inserted 4 of the plugs I got from VW (I got 8, but there were already 4 installed. New ones are white, the existing 4 are grey (2 at each end).
Then it was a simple matter of fitting the new part and using the 8 clips to secure it to the van.
Next job is to remove the spare wheel then remove the under-body panel to be able to bolt in the actual tow bar. Whilst most of the fixings for this are just bolts there are 3 (somewhat corroded) star-lock washers too 🙁