Definitely not gas tank , tank is poly and between the seats and goes toward back. I did drill it today. Scoped the area as best I could, saw nothing. Think it's a quarter inch alum that joins stringers to a structure that would run side to side. What I drilled was fiberglass core material (wood), fiberglass then aluminum. Tapped alum so I will run a bolt in to hold t-top down. Location is to left and right of consol and to front.