Previous ownership search
 

I'd like to fill in the ownership gap on my 1969 GTO RA conv, from the time the PHS shows it being delivered to the Royal dealership (May1969) until about mid 1972.
I have the ownership information from the 1972 until the present.
Does anyone know if there is a person who specialize in tracing vehicle histories?
The Michigan vehicle history reaches a dead end and apparently is not searchable all the way back to dealership or first owner.
Any help would be appreciated.