Hi John,
I looked through the Registry that on this website and did not find your old post car. Having the VIN number made that easy to research. Since I am still in possesion of the Registry Archives, I went though all the old photos. I did find one Turquoise Mist, white top and black interior, post car. This post car was first registered in 1981 by an owner from Maryland, first name John. The car was again registered in 1982 by another owner in Connecticut, first name Joe. Since the archived registry entries do not have an associated VIN, I can not tell if this is your old GS. Did your old GS have the standard spinner hubcaps?
John Egel