Go to any 4x4 shop. NSOR, Sports, 4off etc. You will not want to do that without putting lockers in at the same time as to do so you have set the ring and pinions up again, which is big labour. So you should do it all at once to save the money. You are looking at a grand for each diff all said and done +or- a little probably.
For 33's 4.88 will bring you back to stock ratio. And reading your sig says you are getting 33's. 5.29's return 35 inch tires to stock.
Do not get burts to do any installation work for you, at least not in surrey. They screwed me over on my Tercel tranny, caused me to miss 2 days work, and screwed up my cousins diff. Stay very far away from them.