HELP! looking for head studs for JDM D15b


mating my head w/my block this weekend and looking to pick up some RAP head studs. does anyone in the world have any idea which i need. ARP only makes 2 kits. one say d16z6 only and the other is for the y8 and a couple of others. They obviously don't make them for all the d series, but I have no idea what the difference is. I am assuming the z6 should work fine. can anyone confirm? TIA