Got some new tires yesterday on my 1979 Deville, and I was told by Firestone that one of my wheels was an inch in width shorter than the rest. Three of them are 6.5 (stock?) and one is 5.5. Should I replace the wheel before Alignment? Does this cause problems? Its currently on the right rear. Any help would be appreciated, thank you!

as long as all the tires are the same height it doesnt matter

thank you

Change it. If the wheel isn't right the offset might not be right too and that will affect the alignment. It shouldn't be too hard to find the right one.