I compiled this list from a few marti reports that were posted
Total 1987 Mustang production: 159,145
GT Hatch w/ T-roof: 7314 (4.5% of total production)
LX hatch w/T-roof: Unk
GT hatch w/Sunroof:
Unk LX hatch w/Sunroof: Unk
Total 1988 Mustang production: 211,225
GT Hatch w/ T-roof: 3747 (1.7% of total production)
LX hatch w/T-roof: 863 (0.004% of total production)
GT hatch w/Sunroof: Unk
LX hatch w/Sunroof: 11,744 (5.5% of total production)
Reports attached for the numbers I gave so far. If anyone has more data to have, I'd like to see it