our old wrenches for water over the side, and went through this same thing. We looked all over, but none of the places we looked had one and none of the "universal" fittings worked. Neither did the one svHyLyte shows. In the end we ordered two from the Beneteau parts
website. The one they sent had both water and diesel on a single
wrench. Here's the website:
BENETEAU USA - MARION
My wrench actually has the part number on it- 458867. It is nice that these are metal instead of the plastic ones that came with the boat, and also nice both fittings are on one wrench!