Here are some links to sites dedicated to Volkswagen LT camper vans and/or parts for LT Westfalias. Some are in German, but I have had good responses to emails in English.
The LT Friends site - http://www.lt-freunde.de/
The VW Classic Parts site (in Germany)- http://www.volkswagen-classic-parts.de/
The Eurocar Parts site (in England)- http://www.eurocarparts.com/
The Westfalia LT site (in England?)- http://www.westfalialt.info/index.html