Serial # should help. But you still want to look in the rear in the recessed pocket to determine whether 2 bolts or 1 are used.
If the serial number begins with AF82B, it likely is a 2 bolt configuration. If it begins as AF82C, I'm not sure if 2 bolts or one. If the serial begins AF82F, I know that is a single bolt configuration.
Good luck.
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