Not sure in your case, but the bolt head should be in the tank, the nut, hopefully wing nut should be on the outside of the tank, put a set of pliers, wrench, or set of strong fingers on the nut and turn counter clockwise, if they don't want to budge you could try spraying with WD-40 and let sit for a bit, and try again.
Once you have them out go to one of the big box stores or your local hardware and get some new stoppers (rubber gaskets) and reinstall with new bolts.
When its all said and done there is usually more said than done
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Last edited by Jackofall1; 02-07-2011 at 05:38 PM.