Following the new Oldsmobile name scheme (an O for oldsmobile and a letter for the Car model and then a number depending on size)
(1=small 2=medium 3=large)
O-HB1 Stands for Oldsmobile Hachback 1
O-SC3 Stands for Oldsmobile SportCoupe 3\

Heres the O-HB1:



Heres the O-SC3: