Ok then, I am confused. I have a Rayco Super RG50 and want to change over to the green teeth system. On all the websites I have looked at it says I should use the 1100 series teeth but when you read up on the 1100 series tooth it says it is for 70hp machines and above. The Rayco RG50 is only 66hp so do I use the 900 series or the 1100 series? :msp_confused: