There are several threads on here about Rutherford and his Cadillacs. I just searched for "Cadillac" and several came up. Lots of good information.
I hope someone eventually finds records with the Cadillacs' serial numbers, order information, etc. I've been told cars weren't issued VIN numbers until the 50s, but I would think the bodies and engines had serial numbers. Maybe some insider could check the historical files hidden away at Warwick or wherever. I seriously doubt the Borg would have destroyed those records.