Hi Paul.
I paid $50 for my spare, 108K on the clock.
My sump in the RS is the original modified.
I had to put in a oven for a while and at least a litre of oil came out. Blew up the tig at the tme as well.
The next time it's out I am going to seal the inside with somethng as it tends leak a little in places.
I don't remember if I used one of the "bits" I have in a set or if a std alen key fits. If you are coming over I am sure I have some spare "bits".
Regards
Peter