I have ARP 12pt SS throughout the build but primarily throughout the DSE suspension and drivetrain. ARP only goes up to 1/2" so I sourced and contracted custom 17-4PH age hardened SS 12pt bolts to match tensile strength in 9/16" for the front and rear DSE suspension. I will never look at $50 bill the same again. And you need about 14 btw with a 6-8 wk lead time.