Thanks, none of these fit. I tried them all today.
The beneteau ones don’t fit and the hex ones won’t fit either because the nut has a circular collar around the end just before the base of the cone.If it’s not the Beneteau type Beneteau type zinc anodes for conical propeller nut. Shaft sizes 22mm to 60mm it could be one of these Zinc Anodes for hexagonal propeller nut Shaft sizes 22mm to 50mm