So the pilot-side door/hinges won't fit on my "H" model?
That's correct - the doors will not interchange.
The early model (straight-tail) doors are similar (identical?) in size and shape to the Cessna 120/140. The most obvious external difference is the 120/140 used two hinges per door, whereas the 150 uses three hinges.
The slant-tails all use a much larger, "square" door that has only two hinges. And the hinges are a different (stronger) design.
