Left side inner fenders have round holes, and there are captive nuts on the parking brake bracket for the 5/16 hex bolts.
The right side inner fenders have captive nuts as mentioned by Huck above, which take a special low profile headed 5/16 bolt, in order to not make a bulge in the floor mat. I have never seen this special bolt personally. I am not that picky about a fastener which no one will ever see, and a standard hex head doesn't seem to make a bulge in my floor mat even with a flat washer on it..
Carl
