Carlo:

Quaife do not make a plate diff, its a ATB (Automatic Torque Biasing) Differential, the same as a FRS has as standard and the same as Rainbird uses in his Escort, its non serviceable as it never goes wrong unlike a plate diff.

Gripper and Tran-x to name a few make plate diffs.

The diff is standard size and fits in a standard 7.5" casing, I don't even think Quaife make a uprated rear casing unlike the thick wall front diff casing they do make which I think is what your possibly getting confused with.

It also uses a standard fitment cwp and in this case runs standard gearing

Paul :

I've spoke with my mate and we need to see what room he has before he commits to buying it, its hard to say without seeing a pic really but if you sell it we'll just have one made, cheers anyway