i had a 89 that was the same... the money and time cost of roatating was silly af. never did it and it was fine. also the same on my 2002 ws6, 17x9 front 17x10.5 rear.I once owned a 1986 Pontiac Trans Am. The wheels themselves were different, front vs rear. And the tires were directional as well, meaning they were made to roll one way only. So every tire rotation required a full breakdown and rebalbance of all 4 wheels/tires. What a PITA!!