When ordering new on 2000e models before Jan 1990, if you did not specify the ABS option then you got 240mm vented front discs and standard drums on the back. After Jan 1990, all dohc models had discs all round and 260mm front discs as standard. I have a June 1989 2000e on the drive that came with exactly that. The rear discs will be 253mm standard or 273mm if Cosworth. Check your fronts as you do not want bigger rear discs than front

To the op, your axle will be a 7.5" diff and subframe. If going to a 7" diff, you will need either spacers and the correct bolts or a whole axle. The lsd did can fit with drum shafts, but they do need modding to fit.

The standard servo and master will be designed for drums, so would advise swapping to the larger master and servo as well.