The Gators and Wolverines have faced each other during three previous bowl games and have become familiar opponents in recent seasons.
MI (10-2) was selected for its second New Year's Six bowl in the past three years on Sunday and will play Florida (9-3) for the third time under Harbaugh's tenure.
Gary finishes his college career with 9.5 sacks and 119 total tackles in his three years in Ann Arbor.
The Gators are 0-4 all-time against the Wolverines with the teams meeting for the first time at the end of the 2002 season.
MI also topped Florida 33-17 in the 2017 season opener.
The No. 10 Gators (9-3) will play No. 7 MI (10-2) in Atlanta at noon ET on December 29 in the Peach Bowl.
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Florida will bring a defense into the matchup that is tied with Georgia for 12th in the nation against the pass, only surrendering 175 passing yards per game. But the Boise-based bowl game skipped over an eligible Mountain West team - Wyoming (6-6) - this season in favor of BYU (6-6), which has a significant fan base in the Treasure Valley.
DETROIT (97.1 THE TICKET/AP) The University of MI will take on Flordia on December 29 in Atlanta.
Western Michigan vs. BYU in Idaho Potato Bowl on December 21, 2018.
The last time out, the Louisville Cardinals defeated the Gators 23-33 behind a two touchdown, 266 passing yard performance by then-Cardinals quarterback Teddy Bridgewater.
Mullen would also become the first coach in SEC history to garner 10 wins in his first season as head coach.
Says Gary is the only player he knows of who won't play.