That is the main BGB for all FWD Celica models. But you will also need the All-trac supplement to go along with it since that one only covers the FWD models. Get this if you're getting that:
Yep, that's the one I have. When I ordered my 89 BGB I didn't know either; it was a nice surprise. For 1989, Toyota combined them instead of printing separate books. I think I may have the ST165 BGB on electronic version somewhere. Lemme see if I can find it...