If there is a ridge at the top of a cylinder it will probably break your top ring! If you have a not the best looking bore "Cast" file gap rings are more forgiving then chrome, steel molly, or cast molly! I like Hastings, give em a call! make sure what ever ring you choose use a hone stone in the right grit for that particular ring! And don't use a ball hone! If I was you I would micrometer your cylinders to see how the bore is. or take it to a machine shop for a bore measurement and machine hone!