ATTENTION!
I pulled the nuts off the studs in the pictures.
1 would not come off, 1 came off with alof of force, and a 3rd one came off with medium force. Others spun off with one crank of the wrench.
It appears 3 studs ARE STRETCHED at the fine thread portion. These came out of the outside corners of the head..
With this information, I am accepting offers on the entire set. Perhaps you could purchase 3-4 singles from ARP directly.
Post or PM me a reasonable price shipped.