Cynthia, you can put a belt hook on any wood stocked single barrel. Some of my friends made their hooks out of a large barn nail. Just beat it flat, file it to what you want and attach it.
You can use the bolt that holds the lock or you can cut a small divot in the stock and use wood screws. I found that 2 screws worked better than 1. With 1 screw the belt hook would pivot.
One thing I learned was to position the belt hook so it didn't have to be removed when I cleaned the gun.