I have a Turk Mauser action that miss an ejector and bolt stop assembly and want to buy one to put on. Notice there are actually 2 types on ejector for 98 mausers, round hole and oval hole. What is the difference? Which one fit which mauser? Any difference in bolt stop? This is large ring mauser. I know small ring is different; however, I wonder if I can put a small ring mauser ejector/bolt stop on a large ring and still functional! Small ring part is cheaper. Thanks.