O.E. style replacement 45T rear sprocket for 77-78 Suzuki GS400/400X B/C, 80-82 Suzuki GS450E T/X/Z, 80-82 Suzuki GS450S T/X & 84 Suzuki GS450E D. If you wish to order a different size sprocket to change your gearing, feel free to give us a call to order the size you desire.