Never seen an Australian 2 door Ghia, Not listed in factory coding either. The highest spec in a 2 door is GL rally pac or RS 2000. In either Auto or Manuel. English cars did have a 2 door with vinyl roof. 4 Door Ghia's all had vinyl roofs unless deleted when ordered.
11638 Ghia Sedan 4 Door 1976-6/77 1.6 Litre
11736 Ghia Sedan 4 Door 6/77- 12/78 2 litre
11939 Ghia Sedan 4 Door 12/78- 2 litre
Care to share your build code?