If it's the same as the SD50:-
McDuff is CM 1964 200 2652Z
Plastimo is PL 38334
These are both one piece versions and hence the prop must be removed to change them.
If you have a Stripper, there is a "special" anode. It is same as the above but with an additional drilled hole (0.5 inch clearance drilled through the 25mm radius lug). The Stripper version can not use the newer, 2-piece anode, which can, I believe, be replaced without having to remove the prop. I don't know the p/ns for the 2-piece version.
That you have invested :encouragement: yet another £600+ in a rope cutter. I believe that the Ambassador Marine "Stripper" is the rope cutter of choice for sail drives.