Not sure if you know but there is a Pontiac specialist in Hounslow call Autopontiac. http://www.autopontiac.co.uk Robin the owner is probably the most knowledgeable person in the UK about Pontiacs and has a stock of parts….

Also the Pontiac Owners Club UK has a wealth of knowledge under it’s hat.. http://www.poc-uk.org/

Hope this helps.

Jason.