I have CT grips on three of my handguns. If Crimson Trace made them for my wife's Colt 1908 Pocket Model and my J.C. Higgins .22 revolver, they would be wearing them too (I'm not holding my breath). The set on my 637 Airweight snubby (the visible hammer version of the 642) are the LG305 grips. Don't remember what I paid for them six years ago, but I recommend the LG405 grips to anyone with an Airweight. That little shock absorber high up on the back strap has to be useful. Before I shoot standard pressure 148gr DEWCs at the range, I install a Johnson & Johnson knuckle bandaid on the web of my hand. If I don't, I will create and pop a blister there within twenty rounds. Tried the gloves with the padding there, absolutely hate them.
Sorry, didn't mean to go off thread. It's just that, when I talk about Airweights, I automatically drift off into blisters.
Cordially, Jack