You’re 36???Yes, but that is ancient and non-relevant history. At one time our biggest rivals were Colorado School of Mines, DU and Colorado College. I am probably one of the oldest members on this board but the Utah rivalry was before my time.
IMO, you cannot manufacturer a rival. A rival is a team that the very mention of their name is like someone's finger nails on a blackboard, super annoying. Nebraska and Oklahoma did that for me back in the old Big 8 days - I remember in 1971 season when we ended the season ranked #3 behind Nebraska and OU, that was our best year before coach MAC and we still were behind them.