hi, i have a model 19-5 that i'm hot rodding. i've installed wolff springs systems and better grips and now i'm looking for better sights. millett seems to be the best. i like them because of the white outline and the ability to change height because my gun shoots high. i have tried to get help from both them and midway usa on which model to order, but nobody is any help...no answers. i think i have found the answer but would like a little reassurance. the pre '74 system looks to me like it'll fit because you have to drill the front screw yourself to fit, but my gun was manufactured in 83. does anyone know if s&w made any changes to the length of the sight rail, or if this is even plausible. any help is appreciated.