This gear fits the Long 2510, 2510DTC, 2510SD, 2510SD-DTC, 2610, 2610DTC, 2610SD, 2610SD-DTC, 2360, 2360DTC, 2460, 2460DTC, 2460SD, 2460SD-DTC, 480, 520, 320, 560, 560DT, 610, 610C, and 610DT tractors. Fits models with 8 Speed Transmission w/ 11'' Clutch