The hard polymer LG-207 model is a one-size-fits-all grip for all K/L/N-frame Smiths, which basically turns all of these guns into a square-butt N-frame as far as the grip goes. Also, the LG-207 covers the backstrap, which can cause problems with trigger reach for small-handed shooters.
I also own a set of LG-307's, which CT calls the "HogHunter" model - although it is marketed for handgun hunting, I like it better for CCW and recreational shooting, as this model features rubber overmolding and an exposed backstrap. If your M19 has a round butt, look for the LG-308 HogHunter or the even smaller LG-306, also with exposed backstrap and rubber overmolding.