if you bought them from nissan the backing that the sticker is stuck to has a curved cut out for each side of the truck that you line up with the tail light.
i bought the pro 4 x decals and they lined up perfect by using the backing just set it flush with the tail light and you are good to go
Bought them from everythingnissan.com, they are stock decals. Not sure exactly what you mean, but I don't have the decals in front of me right now. I will look when I get home to see if I understand better. Thanks for your help!