rocker shaft studs

http://www.rockerarms.com/index.html

I just order 16 from them 7/16 20 5/16 ball
6 dollars for each ..they have been in business for 45 years. They make rockers arms etc..
Summit is on back order . Its up to you your choice call and see and ask questions.
Make the call on what you need and choose who you want to get them from.
Just another option to look in to.