I had some on mine and they fit fine. I stopped shooting heavy loads so I went back to the grip that came with the gun.

I think these are the ones S&W K, L, N, X, Z Frame Round Butt Rubber Tamer Conversion Monogrip Black - Soft OverMolded Rubber - Full Size Conversion Grips - Round to Square - K and L Frame Round Butt - K/L-Frame Revolvers - Grips for Smith & Wesson - Handgun Grips - Hogue Products