ARP 250-3005 Carrier Fastener 9˝ housing stud kit. hex. 8740 (Ford rear end) ymm_41 You will also note that

You will also note that ARP offers specially undercut studs for several engines

and it weighs in over 43% lighter than the standard stock version

delivers a material with superior fatigue characteristics and typically tensile strength in the 260

All Pro Series head bolts have a reduced wrenching hex or 12-point head and wide area flange to permit the use of larger diameter valve springs and eliminate the need for valve train removal during cylinder head retorquing

ARP 250-3005 Carrier Fastener 9˝ housing stud kit. hex. 8740 (Ford rear end) ymm_41 You will also note thatSpecifications Socket Size(s) round head, knurl, 9 16 hex OAL 1. 645 Thread Size 3 8 24 Pieces 10 nuts, washers included