I just found out tonight that my K241 I am overhauling has a .020 piston. I have a pretty good piston but I really need to replace the rings. The parts books where I work sometimes list rings for these K series as 'early' and 'late'. I know that has something to do with what thickness the rings are, but I don't remember what the dimensions actually are. I am betting someone on here knows. Can you guys help me decide which rings I need?