Lower Motor Belt Compatible with Bernina Sewing Machines. Part Number #: 305.163.03 V-Belt, 10-1/2” long. Compatible with Bernina models: 707, 708, 709, 717, 718, 719, 727, 728, 729, 801, 801S, 802, 802S, 803, 803S, 807, 808, 809, 810, 811, 817, 818, 819, 900