● Part Number: GY00115 (replaces GY20173). finely cut grass clippings back to the turf as natural fertilizer. Steering Gear Kit for John Deere Ride-ons Mower Replaces GX21924 GX25785 AU. ● Tool-Free Installation – Attaches securely to the side of the mower deck without the need for special tools, making setup fast and convenient.