Welcome to Toymods.
Don't bother swapping in an AE86 diff, they're significantly weaker than the diff in the RA-series celica's. As for disc options look at what guys are doing with old escorts in the UK. You're in the UK so every man and his dog have put an LSD and disc rear end in an escort, so I'd look there. Probably some cheap stuff floating around. You'll of course need to change mounts but you'd have to do that with an E86 diff anyway. You'll want an adjustable panhard rod if you lower your car, but if you do it smartly when you get the mounts changed have the panhard rod mount located in the correct spot and it wont be an issue
The front end is a different story.
Front struts are interchangeable. Freight may be a killer but AJPS.com.au do a very nice RX7 4-pot disc upgrade that I use, in conjunction with a coilover setup.
Camber tops are still available from Cusco
Don't want to give you a bum-steer on the LCA's and Castor rods, these may be interchangeable but I'm not sure. I use TechnoToyTuning (T3) gear specific for the TA22 which is different, so... yeah...
Front sway bars are still available from whiteline.
Hope this helps
JA
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