It may even be easier just to change the whole engine.That's what I would do.Second hand parts can vary in price just don't pay too much as they are heaps about.I take it you have pulled the engine down and found all the drama?I would look for another engine unless you really want to do that work then that's fine as well.Just keep an eye on ebay they come up from time to time.You may even be lucky to find new rings.Bruce may even have some here in the store,I don't know I have never looked.I guess it depends on which way you want to go.There some little things that can be done to make putting it together easier,but we can chat about that when your closer,or which ever way you decide to go.