You are in luck , I have Casey Joneses , a G5 4-6-0? Mantua saddles as well . The Mantuas? inside size is 9 mm. . The cylinders are smaller size overall . MDC 0-6-0 cylinders will work 9mm , econo valve works .?? Bowser / Pennline G 5 4-6-0 is likely the same as a K4? an H9 ?G5 7mm well inside . Quirks ?? Varney mounted their cylinders forward , drill yours centered if needed . Your choice . Drill and file , eh ?? Henry
