The straight cut headers were the 9550 series and the flex heads were the 9650 series. There were very few 30 foot headers ever brought in. Flex heads were usually 20 and 25 feet. The corn heads were the MF 1100 series and used an adapter kit to mount to the 8450_60 machines. If anyone has a need to mount a corn head, I have two new_unused adapter kits including the speed change sprockets.