All of the straight-tails ('59 through '65) use the same door. Borrowed from the Cessna 120/140, but with three hinges instead of two. These doors are somewhat trapezoidal in shape.
The slant-tails, '66 and up, have a larger, rectangular, door that uses only two hinges.
1966 has a unique door - larger than the earlier door, but not bowed out like the later door.
1967 and up all use the same door.
