Give S&W customer service a call. They may be able to hook you up with one. One of the changes with the 69-4 was to drill and tap the frame, hence all the screw holes. They also changed the rear sight leaf at the same time. Yes, I think your best bet is to check with the factory and see if you can obtain the correct one there. The phone number for Customer Service is: 1(800)331-6852.
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Ed
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