According to Nick Stroebel's rather definitive book "Old Gunsights", the Lyman 48 sight for the Model 96 Swedish Mauser is marked "48SMP". I have never seen a Model 48 so marked, so I would give a 48M a try. Holding one up to the receiver of a Model 96 should give a good indication of whether or not it will fit. I probably have one lying around you could use, if all else fails.