[JC]

I did mine today - it was reasonably easy, and even though i didn't have the correct O ring, I had 2 that were almost right - one ID matched but OD was a fraction small, and one OD matched but ID was a fraction large, so I used both with the larger one towards the bolt head. i also used some high temp silicon on the threads so it should stop the leak. For the record, the old o ring was brittle, and had a crack in it.

I degreased and high pressure washed the side and front of the motor, and thoroughly cleaned the alternator too, so hopefully it should breeze through rego once I take it over the pits to transfer it to my name. All up, this took around 1 hour.