UnderSeat Downfire Dual 12" Subwoofer Sub Box for 2000-2003 Ford F150 Xcab 2hole 12" for Ford 2000-2003 F150 Xcab Underseat Downfire. Premium Charcoal Colored Carpet 2000-2003 Ford F150 Xcab, Does NOT fit King Ranch Mounting diameter (hole size): 11 (inches). Wood thickness: 5/8 (inch). Air space: 0.55 Cubic feet. Material: Highest-grade MDF wood on the market. 2000-2003 Ford F150 Xcab UnderSeat Downfire Dual 12&#034; Subwoofer Sub Box Enclosure 2hole 12&#034; for Ford 2000-2003 F150 Xcab Underseat Downfire Premium Charcoal Colored Carpet 2000-2003 Ford F150 Xcab, Does NOT fit King Ranch Air Space: 0.86 Cubic Feet (per sub) Mounting Depth: 5 (inches) Mounting diameter (hole size): 11 (inches) Wood thickness: 5/8 (inch) Material: Highest-grade MDF wood on the market