I need some suggestions on new sights for my two favorite shooters, a 4" 686 no dash and a 4" 617 no dash. The 686 has the red ramp/white outline setup, while the 617 has the pinned black patridge/plain black rear combination. I wear single vision glasses, and my eyes have gotten to the point where I'm having problems sighting. I have a 4.5" 2206 auto with the 3 white dots, and I seem to do very well with it. Anybody know if this type of setup is available for revolvers? Any advice or suggestions would be greatly appreciated.