If you need replacement bolts, check at Lowes or Home Depot for Nylon Bolts. They were in a drawer in the nuts and bolts section when I checked. I recommend checking for those first, if they arent there, I heard toilet seat bolts work as well, but they are too wide, and you have to ream out the holes on the coil. I didn't like that idea, and hunted for a better alternative, and there it is.
Hope this helps.
Anthony