Filter Filters F-250 / 350 / 450 / 550 Remove All Filters Price $100-$500 (10) Condition New (10) Brand Harmony Audio (10) Make Ford (10) 01-14 Ford F250 F350 Ext Super Cab Truck Harmony R104 Dual 10" Sub Box &... $371.99 Compatible with 2001-2015 Ford F250 F350 Extended / Super Cab Truck Harmony... $410.99 Compatible with 2001-2014 Ford F250 F350 Super Crew Truck Harmony F124 Dual... $465.99 01-14 Ford F250 F350 Ext Super Cab Truck Harmony R104 Dual 10" Sub Box Enclosure $230.99 01-14 Ford F250 F350 Ext Super Cab Truck Harmony R104 Dual 10" Sub Box Enclosure $230.99 Compatible with 2001-2015 Ford F250 F350 Extended / Super Cab Truck Harmony... $415.99 Compatible with 2001-2015 Ford F250 F350 Extended / Super Cab Truck Harmony... $325.99 Compatible with 01-14 Ford F250 F350 Ext Super Cab Truck Harmony A102 Dual... $494.99 01-14 Ford F250 F350 Ext Super Cab Truck Harmony F104 Dual 10" Sub Box Enclosure $254.99 Compatible with 2001-2014 Ford F250 F350 Super Crew Truck Harmony F104 Dual... $484.99