You need the new seal for the drive shaft. It's a thin paper one that goes behind the five bolts. There's also a hub oil seal that you press into the back of the hub. It goes right behind the inner bearing. I also reccommend getting a new lock washer, but some people just bend the old ones back over the nut's.
Call Eric at atlantic British he's ext. 231
We've dealt with him in the past and he's very helpfull with this stuff.
I'll try and post a diagram of the whole thing later, but I have to go to school right now.
Matt