Information taken from this thread https://www.danwessonforum.com/forum/revolvers/interesting-rear-sight-information/page-3/

The rear sights coming out of CZ/Dan Wesson are only for the new style and finding rear sights for the old style is incredibly hard.

It depends on which configuration your large frame was manufactured to.  I spent a lot of time on this a few years back and it just came up here recently last week.  The large frame and SuperMag frames were manufactured with the placement of the elevation screw in 2 locations.  The photo below shows the differences – they are both Monson .44’s  The one on the left is a range of earlier Monson revolvers while the one on the right is later Monson and almost everything after (excluding a few Palmer guns with Insight Gun Works).  The one on the right is what you will find on most later Monson, Palmer, and Norwich guns, both large and small frames.  It is the same configuration as Ruger Redhawk and Blackhawk revolvers, Williams FireSight, and what is currently coming out of DW now.  Look at your gun and determine which large frame yours resembles…if it’s the one on the right the Firesight for Ruger Redhawk/Blackhawk will fit it.

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