Did you figure out that Holley no longer includes an air cleaner stud in their Sniper or Terminator throttle bodies? Which is fine if you are replacing a carburetor and have no intention of ever using it again--you can just take that one. But if that is not you, then you're going to need an air cleaner stud. And we've got you covered.
Available in either 1/4-20 (fits most non-Dominator carburetors and throttle bodies) or 5/16-18 (which accommodates most Dominator throttle bodies.) This stud is sized to fit full-sized 5-inch air cleaners. If you have a shorter filter, or if you are using a drop-base, then you'll simply need to cut it to size.