N V OU happened in that Orange Bowl due to a combination of events in 1978 season. Nebraska upsets #1OU in Lincoln, but then the next week vs Mizzou, #2 Nebraska is upset 35-31. Missouri would not defeat Nebraska again until the 2003 season. Independent undefeated Penn St. Goes to Sugar to play undefeated Bama. Notre Dame goes to Cotton. Orange Bowl selects OU as the best match-up. #4 v #6. Heisman winner Billy Sims does Billy Sims things in rematch. 31-24.
I believe that is the last non championship rematch of a regular season conference game to occur in a bowl game. I think Nevada played CSU in a Arizona bowl but it wasn't a rematch.