Filter Filters GMC Sierra Remove All Filters Price $50-$100 (1) $100-$500 (3) Condition New (4) Brand Harmony Audio (4) Compatible with GMC Sierra 2500HD 3500HD Regular Cab 14-18 Premium Speaker... $210.99 GMC Sierra 2500HD 3500HD Regular Cab 14-18 Premium Speaker Upgrade Harmony C69 $83.99 GMC Sierra 1500 Crew Cab 2014-2018 Premium Speaker Upgrade Harmony C69 C65 $171.99 GMC Sierra 1500 Ext Cab 2014-2018 Premium Speaker Upgrade Harmony C69 C65 New $135.99