Filter Filters Sonoma Remove All Filters Price $100-$500 (8) $500 and above (1) Condition New (9) Brand Harmony Audio (9) Make GMC (9) 1982-2004 GMC Sonoma Extended Cab Truck Harmony R124 Dual 12" Sub Box Enclosure $231.99 1982-2004 GMC Sonoma Extended Cab Truck Harmony A122 Dual 12" Sub Box Enclosure $260.99 1982-2004 GMC Sonoma Extended Cab Truck Harmony F124 Dual 12" Sub Box Enclosure $270.99 Compatible with 1982-2004 GMC Sonoma Extended Cab Truck Harmony A122 Dual 12"... $481.99 Compatible with 1982-2004 GMC Sonoma Extended Cab Truck Harmony R124 Dual 12"... $331.99 1982-2004 GMC Sonoma Extended Cab Truck Harmony R124 Dual 12" Sub Box & CXA400.1 $382.99 Compatible with 1982-2004 GMC Sonoma Extended Cab Truck Harmony F124 Dual 12"... $425.99 Compatible with 1982-2004 GMC Sonoma Extended Cab Truck Harmony F124 Dual 12"... $511.99 Compatible with 1982-2004 GMC Sonoma Extended Cab Truck Harmony A122 Dual 12"... $395.99