Eureka Boss & Ultra Smart Upright Vacuum Type R Flat Belt Single Part # 20-3110-07 Eureka Boss & Ultra Smart Upright Vacuum. Type R Flat Belt Single. Fits 4800 series including Models 4870AT, 4870BT, 4870DT, 4870F, 4870G ,4870GZ, 4870GZX, 4870HZ, 4870HZX, 4870J, 4870K, 4870KE, 4870MZ, 4870PZ, 4870RZ, 4870SZ, 4870HZX, 4870T, 4872AT, 4872BT, 4874AT, 4874B, 4875A, 4880BT, 4880A, 4880D, 4885AT, 4885BT Generic Part # 20-3110-07, Eureka Part Number is 67110,67110A-12,67110A, 61110RL