The Replacement Knockout for GM Vehicles is the perfect solution for when the USB Hub (AUX - USB - SD card slot) cannot be retained when replacing the factory radio in GM vehicles. This solution replaces the entire hub with a new spacer/knockout that includes 2 female USBs - a female 3.5mm Auxiliary jack - and a female HDMI port. Also available in a 6ft length. (see part AX-GMUSBAUX-6)Specifications: WARNING CA Proposition 65 Yes WARNING CA Proposition 65 Message WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov Description_DES 3 ft. USB HUB Replacement Knockout Description_EXT 3 ft. USB HUB Replacement Knockout; Description_FAB Replacement Knockout For GM Vehicles Description_FAB Includes 2 Female USBs Description_FAB Includes Female 3.5mm Auxiliary Jack Description_FAB Includes Female HDMI Port Description_FAB Also Available In A 6 ft Length/See Part Ax-Gmusbaux-6 Description_FAB 3 Feet Cable Description_MKT The Replacement Knockout for GM Vehicles is the perfect solution for when the USB Hub (AUX - USB - SD card slot) cannot be retained when replacing the factory radio in GM vehicles. This solution replaces the entire hub with a new spacer/knockout that includes 2 female USBs - a female 3.5mm Auxiliary jack - and a female HDMI port. Also available in a 6ft length. (see part AX-GMUSBAUX-6) Description_SHO USB Data Cable