You don't need another set. You can gap them back and forth. I wouldn't do it 50 times, but you can do it 3 or 4 times with no problem.
1994 C280, dark green metallic
1991 190E 2.6, Black
(sold to another forum member)
2003 Chevy Tahoe LT, Redfire Metallic
1989 Mustang GT Cobra Convertible