If not re-using your old MIM style stirrup, you will require new Mainspring Stirrup sold seperately. Mfg: Smith & Wesson
Smith & Wesson Hammer, .500" Target, Mim, For Frame Mounted Firing Pin
$50.99
FITS: 10-11, .38; 13-5, .357; 14-7, .38; 15-8, .38; 19-8, .357; 64-6, .38; 65/65LS-6, .357; 66-5, .357; 67-4, .38; 256-6, .357; 696-1, .44 Spl
