Aldridge will be playing his 43rd game in the blue and gold uniform, but due to his New Zealand and Northern Districts commitments, it has been six years since he last played for the Bay.
In just 17 games for BOP Flynn has blasted two centuries, posting an unbeaten 103 against Northland in 2003, followed by 119 against the same province in 2006.
Boult (10 games) and Williamson (12 games) both made their Bay of Plenty debut while still at high school.
To give the game a real edge, the final ND Hawke Cup Challenge points are on the line, with the winner of the annual series earning a Hawke Cup challenge in March next year.
While the Bay of Plenty side lead the standings from Northland, they must take at least first innings points from Counties to book a Hawke Cup challenge.
Bay of Plenty: Jono Boult (captain), Joe Carter, Peter Drysdale, Bharat Popli, Kane Williamson, Trent Boult, Graeme Aldridge, Daniel Flynn, Corey Anderson, Tim Clarke, Brett Hampton, Tony Goodin