Im also Running, 35/12.5/16 tyres, the minumum amount of body lift you can get away with is 40mm, and a 3" lift, Suspension stuff do 3 & 4 inch lift for them, they only list it on the web site under Range Rover but if you give him a call he will do Disco's.
Ive also got extended bump stops, castor corrected QT front arms, cranked rears, Detroit rear locker, Kams front Locker and Kams H/D Axels all round with fuseable front stub shafts, been running 4.11:1 CW&P sets (A MUST) but about to update to Kams 4.75:1's soon :angel:

