Remove one of the old studs from the head and take it to a hardware store, parts store, or Fastenal. Have them match it up with a grade 8 stud with washers and nuts for the manifold side.
Some of the hardware stores by me are obsoleting the studs. Fastenal should have some, look them up on the internet and see if they have an outlet near you.
Also, my Ace hardware says that they can order the nuts/bolts/studs if they are not in stock.
The studs make it easier for you to hang and line up the manifolds while installing. Try supporting the intake and exhaust manifolds and then try to find the hole for the stud and get it threaded in without cross threading.... Go with studs.... Be 'studly"...
