Had a friend lay loose '57-'58 MM corner glass on top of '59-'62. They are not the same. Height is about even. '57-'58 is considerably shorter in length. In dire need, utilizing a '57-'58 piece in a '59-'62 (combined with larger rear side glass) wouldn't even work.
I would have lost money on this bet.
I would have lost money on this bet.