I have a set of the K-frame Hogue Bantams on my 64-7 and couldn't be happier with them.
I love the round butt grip profile and these Bantams allow me to keep the exposed RB backstrap but add more grip and fingergrooves for a functional grip. I don't think these are the choice if you want a "looker" as your carry piece, but these grips are very functional and are good for CC or if you're like me, and just like a compact grip. These fit my hand perfectly.