I bought this hoping it would work for my particular application. I lost my snow blower gear and as it is no longer made, a 1989 snow blower I had to guess what size it was. I measured the wave and started searching from that point. Since I lost the gear, the neighbor found the gear in his driveway and lo and behold, it's the gear. So it's a replacement, but it's not exactly the same size. However, this will/should work as the parachute's rotation system is adjustable. This is a John Deere 520 Snowblower in case anyone is still looking for a gear/sprocket replacement.