This is probably a stupid question. The innder trunk brackets have two oval holes for your bumper to bolt through and then one other 3/8" or so hole that doesn't appear to have any useful purpose? I went to a car show yesterday and checked out a trunk and there was just silicone in it? I was just going to weld it up unless there's a reson for it. The trunk seems to have numerous similar sized holes in the drop down area where your gas tank goes, why?