What country are you in ??
There will be a metal tag on one of the bolts that holds the cover on. It tells you which type of Borg Warner, and also the ratio (makes life easy at the wreckers).
* Australia-assembled KE70
* some MKII Ford Escorts
* some Cortina
* AUS Mitsubishi Sigma 6.75 diff
* Australia assembled Corona
* TX and TC Gemini (Australia-assembled)
* South Africa-built Cressida
* Escort RS2000 South Africa used an M68 LSD