I have a Cub cadet 147 with a Kohler k321 in it. I am rebuilding the motor. I have a relative who is an experienced but not certified mechanic. He came over to help me put the piston rings on and he snapped one. I don’t want to order a whole ring set so I was wondering what size the standard piston rings are because there is no information on that online? Where can I get just the main rings for it. If it comes to it and I just have to get a whole new set where can I get them locally without having to order them and get them shipped?