That will probably be hard to find; but it will be easy to make.

Dovo makes great stainless blades. You could get one of their 5/8 stainless blades and reshape the tip from round to French, Spanish or whatever you want. If you want to spend more time, I suppose you could hone it down to a 4/8 width, too.
If you don't know how to do all this, you could contact one of the restorers / honers in the vendor section, and ask them if they would do it for you.