I have a Schofield Replica, and the factory grips are too short for my hands. I've found a lot of "Custom Grips", but they are all the same length as the factory grips.
You will probably have to have a Gunsmith make you a pair to fit your hand, if you can't find anything off the shelf to fit. Anyone making custom grips should be able to make these easily, or a qualified Gunsmith if not.