I believe that is called the leaf spring axle U-bolt plate by Ford
( the plate where the U-bolts go through under the rear axle tubes )
Ford Explorer Column Shifter Lever Bracket Repair
A 2004 Ford Explorer gas tank holds ( 22.5 U.S. gallons )
The gas tank on the 2003 Ford Explorer holds 22.5 gal..
The gas tank on the 2012 Ford Explorer holds 18.6 gal..
According to the 2012 Ford Explorer Owner Guide : ( 18.6 U.S. gallons )
The gas tank on the 2002 Ford Explorer holds 22.5 gal..
The gas tank on the 2014 Ford Explorer holds 18.6 gal..
I believe the 1992 Ford Explorer 4 door holds 19.3 U.S. gallons
The gas tank on the 2008 Ford Explorer holds 22.5 gal..
The gas tank on the 2001 Ford Explorer holds 21 gal..
The gas tank on the 2004 Ford Explorer holds 22.5 gal..
The gas tank on the 2010 Ford Explorer holds 22.5 gal..