Not sure how this compares to any other kits, but I took literally the cheapest route I could find to get me Grade 8 fasteners:
Dorman #675-007 STUD, 1.000 in. shoulder length., Base Thread Size: 3/8-16 in. 0.750" long, Top Thread Size: 3/8-24 in., 1.000" long, OAL 2.750"
...mind you, this is for my W2 heads which use the 3/8" thread, but I'm guessing Dorman has the other sizes as well.
The kicker: set of 10 pcs was $11.69 USD in 2019, I see them listed at Summit for 2x that at $25 today.
Take a look at the attached snippet out of their 2016 catalog, showing the 5/16" section...
Last edited by Diplomat360; 10/03/23 08:16 AM. Reason: included the Dorman catalog page