This kit includes all of the parts needed to do a head gasket replacement in your 2007.5 to 2018 6.7 Cummins.
Choose your option for gaskets and head studs (or factory style bolts)
ARP2000 and Xotic Standard studs are rated for 220,000 psi tensile strength.
ARP 625+ and Xotic XP2 studs are rated for 260,000 psi tensile strength.