Rick, as I wrote you on three separate emails, you got the postal adresses of Veronique Siffert (daughter) and Philippe Siffert (son). Also, I provided the adress of journalist Laurent Missbauer, a friend of them.

You might prepare a photo documentation about your car and sent it to all three of them. They understand english. Tell them what you need, what you beleive (personal car of Siffert prior to Ex-Milou 1971 911S ?) and all important details. Provide your email adress. Wait.

If you never get an answer from them, I call them. But I prefer we give them the proper infos first to let have them answer to your case.
Best K