Selector rail retaining ball Models 122, 130, 133, 135, 135 Petrol, 140, 145, 148, 150, 152, 155, 158, 165, 168, 175, 178, 184, 185, 188, 230, 233, 234, 235, 240, 245, 250, 253, 254, 255, 260, 335, 340, 342, 350, 352, 355, 360, 362, 365, 372, 374, 375, 382, 383, 384, 387, 390, 390T, 393, 396, 397, 398, 399