I added a target hammer, trigger and grips to the heavy-barreled .22 (S&W Model 63-4, 5" on J frame) and it's about 85% the size of the larger Model 66-2 (6" on K frame) in .357 Mag that I just picked up. I'm changing the SS trigger to a case-colored smooth-faced one, but it needs to be fit a bit more (the hand binds for some reason), while the cased hammer I got was an easy drop-in to replace the SS one that came on it. And as you can tell -- yes, I'm partial to Altamont grips.
As for "pairs", these pair very well with my .22 & .357 Marlin leverguns.

Tight groups to all.
Old No7