Pre-wired taillights are stud mounted using 2" O.C. industry standard stud configuration Kit includes two taillights, 25' trailer wiring harness with molded four-way prong plug, 4' car harness cable with molded four-way flat prong plug and license plate bracket Taillights measure 5.5" W x 4.5" H x 1.75" D. TAILLIGHT LED UNDR 80 KIT