Bob, I don't have one for sale, but I wonder whether you have tried making a repair usng Araldite or JB Weld, which could well be a lasting (and cheaper) solution.
As Colin states, you can make a very effective repair with epoxy. Devcon is an epoxy which is specially made for ally castings. I used it to repair a badly corroded water pump. It is easy to apply, easy to shape with a file/emery cloth after it has cured and results in a very sound repair.