I know this isn't quite what you asked for, but as I recall, the C-Moore company used to make different colored polymer front sights for the Redhawks. I had a buddy that had one that was so equipped with a neon green colored front sight that made long range shooting a real joy. Maybe you could contact that company to see if they have anything for you. Also, have you contacted the Ruger factory to see if they still have any in stock for sale?