The AC-LGD 20s come in pairs and can be easily connected to your AudioControl Factory System Upgrade product with the pre-wired connectors The AC-LGD 20 is installed between the factory speaker outputs and your line output converter Dimensions (without wires/connectors): 2.3?L x 1.0?W x.06?H Dimensions (with wires/connectors): 9.75?L x 1.0?D x.06?H