ARP Cylinder Head Stud Kit, for Nissan RB20DET, RB25DET and RB25DET NEO Engine. Securely mount your Mustangs cylinder heads by replacing that old weak stock factory hardware with high strength ARP2000 Fasteners. ARP2000 Fasteners are ideal for high performance street and track Mustangs. Made in the USA from an exclusive hybrid-alloy “ARP2000″ that features a black oxide finish to resist corrosion, these ARP Cylinder Head Studs are hardened to a tensile strength of 190,000 psi to provide superior strength for long-lasting performance. This kit includes head studs, insert washers and nuts. Note: Picture for reference use only! Type of Return Request.