Gibe CVA a call. They were very help full when I picked up a CVA SXS .50 Mussleloader. This one had a broken hammer and the rear sight was an odd one. CVA provided the replaecment hammer and a multi leaf "express" sight. They didn't list anything on their web for this.
-------------------- "A hunter should not use a rifle that will kill an animal when everthing goes right; you should use one that will do the job when everything goes wrong." 88MauSporter