Both sprockets in the third picture seem to have terminal wear. The one in the first picture looks OK, and the little one in the second picture could probably soldier on for a while - I think I'd replace it when I was replacing the chain, but keep it in the meantime. Is that one of the worn chains?
Deejay and deviosi would be the main guys here on where and how to get parts for Scott Bonnars I think, but some other members are likely to be of help also.
