Rotary Copperhead Mulching Mower Blades Fit John Deere Models D100 LA100 Replaces OEM GX22151 GY20850 For 42 Inch Deck (pack of 2) Rotary replacement lawn mower blades. Fits certain John Deere lawn mowers. Fits OEM: AM137328, AM141033, GX22151, GY20850. Two (2) blades required for 42-inch decks. Quantity: 2 Pack