ARP NUTS, Part# 16-5838

ARP brand nuts.  Available in 2 sizes.  8mm x 1.25 thread for most cylinder base studs with 10mm wrench size.   10mm x 1.25 thread for DM base studs with a 12mm wrench size.  These are used as they have a smaller wrench size for tight areas.  Part# 16-5838