MOWER DECK MANDREL PULLEY 42" 50" 54". REPLACES THE FOLLOWING PART NUMBERS 129861, 153535, 173436, 177865, 532173436, 532 12 98-61, 532 17 34-36, 532153535, 7180, AND 275-284. DIMENSIONS: WIDTH: 7/8", 42" AND 48" DECKS. IMPORTANT THAT THE SPACER (THICK WASHER NOT INCLUDED) IS INSTALLED UNDER THE PULLEY, NOT ON TOP BETWEEN THE PULLEY AND THE LOCK NUT. IF YOU ARE NOT 100% SURE THIS IS WHAT YOU NEED, PLEASE FIND OUT FULL MOWER MODEL NUMBER AND E-MAIL US TO CONFIRM BEFORE YOUR PURCHASE.