Are you looking for wood boot grips or rubber ones?

These were made by both Sile and Uncle Mikes several decades ago. Not too comfortable to shoot, but really small to conceal
I went back to the factory Combat grips on that one, but I do not really carry it concealed any longer.
I am very fond of the Pachmayr Compacs. That grip is what the facotory shipped on all of the Night Guards in the beginning. Eventually they switched to a longer grip
I have even pocket carried these N-frame Night Guards in the 5.11 Covert Khakis While I initially felt self-conscious, no one ever noticed. Now I never worry about what I pocket carry