I aquired a 40 FSR from a friend. I noticed some of the o-ring are worn. I understand parts are not made for this engine anymore. I am looking for the o-rings and gaskets. Are they used in another engine? Also, did OS produce both ringed and ABC type FSR 40s. How can I tell the difference.

If they did make both... what is the best way to brake in a ringed... a ABC?

Thanks