If it's the rear you need the cap to keep the grease and bearings clean and they are available at any auto parts store. If it's the front what you see is normal but you may be able to get some kind of center cap to hide them.
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Journeyman Polyphase Meterman IBEW Local 387
Work with enthusiasm as though you were working for the Lord rather than for man.
Siena Jeep Owner's