PartsSquare QTY(4) T20 7440 W3X16D Socket Harness Plugs Connectors Pre-wired wiring sockets #HS LED Bulb Socket Connector Plug-in Light Bulb Extension Nylon material, hight efficency copper wiring 7440 Cross Reference: W21W, 21W, W3X16D, ECE ( SIGLE CONTACT)