ARP Bolt - 5/16-18 in Thread. Manufacturer part number 3AG1.250-2S. Sold each.
Arp for 725-1250 3/8-24 x 1.250 hex 7/16 wrenching SS bolts
Arp for 741-1250 5/16-24 x 1.250 12pt black oxide bolts
Arp for 625-1250 3/8-16 x 1.250 hex 7/16 wrenching SS bolts
ARP M12 x 1.75in x 1.450in / 4.600in Length ARP 2000 Single Stud
ARP M8 x 1.25 x 51mm Broached Stud Kit - 16 Pcs. - 400-8034
ARP M10 x 1.50 x 90 12pt SS Bolts (5/pkg) - 772-1011