Fits Cummins 5.9L 12V - 1989-1998 - DK Head Stud Kit These studs ensure proper sealant between the cylinder head, head gasket, and cylinder block. The stock design used bolts that would eventually lead to blown head gaskets and other issues due to the fact that the bolts would be pushed beyond their limitations. Studs are used to tighten the seal and also restrict the amount of stretching and twisting of the studs by acting as a clamp instead of a bolt. IF YOU NEED MACHINED ROCKER BRACKETS, WE HAVE THEM! Please call if you have any questions. Our 5.9L 12v studs have an ultimate tensile strength of more than 210,000 psi compared to leading brands rated at 200,000. DK Studs Kits contain: Complete Head Stud Kit 20 "Short" Studs 6 "Long" Studs 26 12-pt Nuts 26 Washers 6 12-pt Bolts Thread Sealer Instructions This kit fits Cummins engines with: Dodge Pickups and Cab and Chasis with Cummins 5.9L 24v 1989-1998