True... Well if it helps at all the S-series has a 6.38" crownwheel, and according to Helene & Matti came in:
Corolla TE21,27,28 (some) 71-74
Corolla TE31,37,38,71,72,75 75-82
Corolla AE71,72 83
Tercel AL10 80
And the T-series is 6.7", came in:
Celica ALL 71-85 (RWD)
Corona RT85,95,104,114,105,115,119,134,32,34,36 72-82
Corolla TE37,51 75-79
Corolla TE27 (some) 74
Corolla AE86 83-87 (?)
Although how accurate that info is I don't know... After all Australia seems to have gotten a good mish-mosh of cars...