Great picture. I believe the 2 little tabs those folding little tabs to wrap around some flexible fuel line. The other one with the bolt is the hold-down clip for the fuel vapour line. I'll get some pics of my truck later today and post them up.
Here ya go two of the tabs look to be broken of on yours they hold two of the rubber line that come from the tank to the vent system the other that is bolted holds a metal vent line a the 4 bolting points hold the sheld.