Your first link has the correct sights, here is the link from Millett. S&W revolvers are listed in the chart.
http://www.millettsights.com/control...cat09/revolver
The second link is for semiauto sights.
Unless you have the S&W sight screw/nut staking tool and screwdriver tool, I would just buy the whole sight assembly from Millett and replace the whole sight. That way, if you decide to return to factory sights, it is easy to do. Be careful with the Millett sight, the long top strap spring can be brittle.
Like PetahW said, call Millett customer service and let them help you out.