(6) Rotary 10377 Mower Blade AYP 173921 and Husqvarna 532173921, 48" Deck Rotary replacement blade fits AYP and Husqvarna. 173921, 532173921, 917532173921, 954633781, 532173923 3 Blades Required for a 48" Deck Quantity: Pack Rotary Mower Blades manufactures high-quality, OEM replacement lawn mower blades