I found these to show those who may not know.
From what I remember S&W produced this kit from about 1970-ish to about 1985 ... (more precise production dates of these kits are welcomed).
I know they are obsolete for a VERY long time. These packages pre-date Bar Codes, UPC and SKU designations.
As printed on kit ... for ALL K frames except the .22 Caliber.
I would presume it would fit all models as printed but, more precisely, from what years to what years.
Reasonably should fit (at least) 1950 to 1995/1999 and, perhaps, some newer "Classic" series.
It will fit models 10, 11, 12, 13, 14, 15, 16, 19, 56, 64, 65, 66, 67 and others. Not sure about 686 and some others, I just don't know "which" others it will positively fit. Will it fit a Model 53 with is a Center fire .22 Remington Jet ? Does the 53 use same firing pin with 22 RemMag adapters ?
I have no clue if they would work in early post war or pre-war K frames but I wouldn't risk attempting to install on a pre-war unless someone has successfully done so.
Enjoy.