I've read that some people have trouble with "the dealer" in the states when the car isn't an official import - that might not be the case; but if it is the classic centre in California is meant to be the place where you can always get an answer and of course the sponsors of this site.
If you want more VIN information try the link posted here
http://www.peachparts.com/shopforum/2844671-post11.html
(Ignore the title of the thread - there is an answer in there)