Has an AFL game ever ended 58-51?
Exactly once. On May 3, 1930, Carlton beat Essendon 58-51, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 58-51 in league history.
That makes 58-51 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 59-51 has happened 4 times and 58-52 has happened 4 times.