OP, they're both tapered seat lug nuts.
Any pics of someone who's mounted these on 2nd gens?
Concerned about spacer width making them too aggressive.
Whose adapter are you using? (Assuming you're putting the 6x5.5 wheels on the 6x4.5" truck.
Pardon the hijack.
2012 Frontier CC SV 4x2
Callaway Turbo Mercedes-Benz (Temporary caretaker)