SN is for the 1919 NRA, SS is for the Sporters - the stock contours are slightly different and these sights are made to mount with wood screws on the stock at the wrist. These were not popular sights and you see many for sale that are 'new in the box'. You may be able to position this on the stock of a Sporter so it lines up but it might be to tall for the existing front sight, the NRA's had taller front sights. If you have a nice rifle I don't think you want to put holes in the stock and these sights can often cause uncomfortable thumb positioning. On the very few I have seen with a sight mounted to the wood some have had some wood removed to seat the sight better (& lower & probably straighter). I have a 1922 Sporter with a wood mounted Marbles sight but it already had the holes in it when I got it and the Marble is made to wrap back around the contour of the comb so it does not get in the way of thumb positioning.
Here is a couple pictures showing 1922 SPORTERS with some different sight options. The scope is a Stevens made especially for the 1919 NRA and 1922 SPORTERS that was made after Stevens was bought by Savage Arms. Your sight would mount with the front of it's base about were the front of the base for the Marbles is.
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