SilverTurnedGreen
Guest
I see that no one has replied to your question, so I will!  I'm assuming that you're asking what a compatible Gleaner combine would be to a 550 Massey.  My answer would be to find either a late model M2 or M3; - either machine would exceed the capacity of your 550.  Problem is that they're getting tough to find, but they're out there.