ARP BMW 535 635 735 head stud kit (201-4602) DT The top of the valve

The top of the valve has a -6 ORB female thread and a stainless steel ball

then source through long term vendors

Fram CA9683

ARP Pulley Fasteners 400-3203

Part Number: AF25-4000SS-BL

ARP BMW 535 635 735 head stud kit (201-4602) DT The top of the valveARP BMW 535 635 735 head stud kit (201 4602) ARP Pro Series Cylinder Head Studs 201 4602 ARP Pro Series cylinder head studs are cold forged to ensure molecular integrity. They're heat treated prior to thread rolling and machining. ARP Pro Series kits are also available with 12 point nuts, and all studs come complete with hardened parallel washers for an even load distribution and accurate torque readings. With hundreds of models ready to ship, these