Does anyone know how far in I should be driving the output seals? Specifically the rear one? I forgot to measure the distance between the casing and the top of the seal so I know how far in to drive it.

Do I just keep going until it's seated against circlip holding the bearing in, or does it just sit part way in the housing?

Al.

Sorted. I just tapped the seal in a bit and then put the flange in. You can see a mark on the flange where the old seal ran, so I just offered it up, and tapped it in a bit, little by little until the mark on the flange lined up with the outermost lip on the seal.

Hopefully it won't leak...