Never a Gori prop again!
At $60US for an annode, I have to say that I would simply get my brand new one and make a mold with either muffler clay or plaster. I would then be casting my own annodes thereafter.
You can melt them in an old saucepan on a stovetop, for goodness sake....
And of course, a wander around any marina in the world will quickly yield bucket loads of half eaten-away disposed of annodes which will melt down perfectly happily into your custom fitted gosh-wow expensive propriatary annodes.
I do not bother with this for the normal little annodes (about $20 every two years is nothing), but for what you described, I would do it out of sheer bloody mindedness at being ripped off.
P.S the fitted annode for my austral autostream prop is a whole $12AUD, and the prop came with three spare annodes when bought new.