that's going to be a tough one as I have found not only 2 lengths but also 2 different threads (fine/coarse). I have a 66-3 and ordered S&W rosewood grips which look and feel great. The screw was too long that they sent, 1". I ordered all of the lengths from Midway and Brownells, not only were they all too long but they also had the wrong threads. I finally ordered the screw checker / length jig from Brownells and used my grinder to custom fit one. Sometimes folks have special ones on GB.
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