They are probably plugs for the holes used by the AIR pump manifold. You may not have had that manifold design, but when they make them for aftermarket replacement, it is cheaper to put plugs in than it is to make and cast a second design and then keep that one in inventory too...
Just make sure they are snug, and leave them be.
1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy
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