Highest number in link above is 4412002 which correlates to 1986 M-body with 318, so I would expect your trans to be for a 1987 /1988 M-body. Does it have the converter lock-up clutch connector on the backside of the case under the tail housing (driver's side)?
PK 4431556
9293 = Day 9293 is Tuesday, January 6, 1987 (10,000 day calendar)