Dorman 604-5104 International/Mack Air Door Actuator Direct replacement for a proper fit every time Recommended for replacement during blend door replacement High quality plastic housing and motor/circuit board included Dorman's quality testing ensures year after year of trouble-free service Original equipment (OE) number: 100830, 2115003, 2383, 2503207c1, 651261, 7787650694, ma1640, ma1705, rd5146090p, s17945