While looking at a couple post about interior storage I found the addie for Tuffy Boxes and found this on the Tuffy Site:
Ford Trucks, P/N: 876-200745
-Ford F150 1987 + (includes new body styles)
-Ford Super Duty F250, F350, F450, etc.
-Lincoln Mark LT 2005+
-Ford Ranger 1993+
Although this is not as cheap as another protection that was posted on this site is does look interesting, $25 + $6 shipping, not too bad.