N2 Heavy Duty Flat Idler Pulley Replaces MTD #756-04129B and 956-04129 ID: 3/8" OD: 4-7/8" Height: 1" Replaces MTD #(s) 756-04129B, 956-04129; Toro #(s) 112-0314. Fits MTD models with 38", 42", 46" & 54" decks.