james-1
I think you will find that the original sight on your rifle is shorter than the one on a German military k 98 Mauser. One from some other make or model( 1909 Parag.) might fit, but I think your best bet is to check with manufactures of rifle sights, they may be able to help you. A couple manufacturers that have websites with downloadable catalogs are: Recknagel( ERA) and Ernst Apel Wuerzburg( EAW). If they cant help, I'm sorry.
Mike