If you look at the blow up of the hub you can see the seal that goes in the back of the hub. It holds the back bearing for the hub. You should be able to put the bearing in its race and then put the seal in. Come to think of it the seal hole maybe bigger than the bearing and the bearing might be able to go in after the seal. Double check the old seal to verify if it looks bad. It might be OK. There are actually 2 sets of bearings (4 bearings total) One set is in the hub itself and one set in the strut. In the blow up of the hub you can see the Hillard clutch and the bearings and in the blow up of the strut you can see the magnet and the armature plate as well as the bearings and all the washers and lock nut. Don't unbolt the 2 bolts that hold the shock portion of the strut in place. Just take the nut off the top that holds the whole thing at the top mount to the 4 wheeler. The spring will remain tight as part of the strut. Again look close at the seal in the strut and the hub and see if the look buggered up or like they have been leaking. You might not have to replace them.