Since your DSO indicates your SSP to be a possible South Carolina Highway Patrol car, I'd search through posts to see if anyone has a SC car listed in their signature. Somebody who has already done the research may be able to help you. One online source I checked says that there were 65 SSP's purchased by SCHP in 1988, so I'm confident that there are other known SC SSP's out there (FYI - it didn't shown any 93's being purchased by the SCHP, but the data is only as accurate as the person entering the information).
You can also contact the SCHP directly -
http://www.schp.org/
They may have a museum with somebody who could be of assistance. But use the phone rather than email for initial contact. Thank you's and supporting info can be done via email.
Be patient and diligent, and most of all good luck!