Valve Cover Bolt Size

Hey all so I am reinstalling my valve cover with a new gasket and the two bolt holes on the intake side of the engine seem to be smaller than the rest. There weren’t bolts on there before because I’m sure a previous owner ran into the same issue so he just left them out haha. I was wondering if anyone knows the exact size for the two bolts before I go out and buy a bunch of them. The other bolts are 1/4 inch and 20 thread size if that helps. 1984 Jeep 258. Thanks!