I'm ready to drop my budget pistons into my budget bores. This an 836 '75 CB 750F btw. This kit came with no instructions whatsoever so I'm winging it here. In the attached pic, which would strike you as the top ring and why?The one with the chrome outer edge seems like it might have a small chamfer on it. One side more drastic than the other. On that one which side would be up between the bigger and smaller chamfer? The black ring seems to be dead square.