A quick vote for Hogue - bought rubber grip for a Single Six last spring and it fit perfectly. IMHO quality is on a par with Ruger - excellent. I'm sure Lett is also excellent, but have no personal experience with them. Hogue says they expect their grips to fit Ruger perfectly the first time because Ruger guns are built consistently to very tight specs, and they can count on them, so the grips don't have to have wide tolerances in their dimensions. Thus, they fit. That's been my experience.