I have 66's ranging from -2's to -4's and want to gather up spare parts for them for the future what if's. Does any know or know where I can get a list of what parts that will inter change between the group and which parts fit individual series. also have a 19-4. Any assistance would be greatly appreciated.
Thanks,
tbird

I wasn't worried about any part interchange but the hammers(-2 hammer in your gun has no spring behind the firing pin, later hammers do). A call to S&W confirmed that a -3 and -4 hammer will work. The -5 and later hammers, of course, are flat faced. Aside from the rear sight leaves everything else should fit. I don't recall if they used a floating hand in any of the K's(only familiar with the L's) but even that can be changed to the standard hand if needed.

Thanks, that helps set me in the right direction.
Thanks again,
tbird