Also found some lower cost alternatives, Summit says they are grade 8.
Dorman 675-004
2.125" OAL $13.99 set of 10
Double Ended Stud - 3/8-16 x 5/8 In. and 3/8-16 x 1 In, with 1/2" unthreaded
Link to Dorman web site 675-004

These might be more to your liking (if not paying for the nice ARP)
unthreaded tip Summit Link Dorman 675-115

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1