As posted above, the 48S was never used on an Armory product, having been introduced after production of the "Sporters". The only correct sight is the short slide option Lyman 48.
The long-slide 48 was used only on a prototype Cal..22 M1922 rife, so does not belong on a Sporter.
The 48B and later 48C were target sights (no turn-down peep) used ONLY on target rifles.

By the way, the headless cocking piece will be a replacement of the issued headed one.