the problem is that without a copy of the invoice or the tank sticker, all you are able to get is a more or less generic "window sticker". there is a company that is actually authorized by GM to reproduce them, but they require a copy of the dealer invoice for a really "authentic" sticker reproduction. since there are no records for the earlier C3's it is almost impossible to get the necessary documentation. you can however get a window sticker that is made up to the specifications you provide (as far as dealer name, options, etc). i don't remember where i got the name of the authorized reproduction company, but i'll look around through my records and see if i can't find an invoice or something else that might help. in the meantime, there have been loads of posts and threads on this subject. try doing a seasrch on "window sticker" or "dealer invoice" to get started.
steve