When I got my coils from NWOR, they were marked for driver side and passenger side. NWOR said that if installed backwards that the truck would be higher on one side by and inch. Well I installed my NWOR coils, and everything is fine, but I sold the TRD coils, and shipped them off to a guy. I forgot to note which coil was which. It think on one coil the markings were white and pink, and on the other coil the markings were white and red. Anyone know which side is which so this guy doesn't have to install the coils twice? My truck is a 2002 TRD 4x4 if it makes any difference. Thanks for a quick reply, I think this guy is real anxious to install the coils on his truck.