Get the corn head. They are getting harder to find in usable shape. It will directly fit all JD 3300 combines and JD 45 and 55 with the new style feeder house. It would fit a JD 4400 to but the combine is too wide to use it. JD feeder house openings are a standard. Clear up to the the 12 row heads.
Like I posted a while back the guys in the shop hung a JD 244 on a JD 9610 combine as a joke. It would fit the feeder house.