I bought a Contender in 1973, #42,xxx which had this smaller grip with the ridge down the left side for a thumbrest for right handed shooters, so that one is correct for your gun. It is a nice grip for those with smallish hands, but that "horn" behind the hammer is mighty uncomfortable for hard kickers. Still, it's not as bad as the first style grip, which will absolutley chew up your hand with hard kickers.
RonF