We are currently working on one ourselves - good timing....
Go to Ace hardware (or comparable hardware store) and look in the fastener aisle for a drawer marked "Automotive Studs" (make sure it's the SAE/English one not METRIC).
You want to get the 5/16" x 2" long stud, it will be slightly longer than the original.
The 5/16" x 1 1/2" long will be slightly shorter than the original.
They ask about $2.25 for each one. There are 13 studs total for the manifolds. You may have to go to 3-4 stores to find enough to do them all, as they usually don't have but 4-6 in most stores...
I have held them at the bottom of the shoulder to see how long they will be after installed:
The two compared side by side:
View attachment 1714885013
Here's the 1 1/2" one:
View attachment 1714885014
Here's the 1 1/2" long stud and how it compares to the stock stud.
View attachment 1714885015
Here's the 2" one:
View attachment 1714885016
Here's the 2" long stud and how it compares to the stock stud.
View attachment 1714885017
