Original Case part # C15615Fits J, K, L, M and N series, 44" and 48" decks3/4" ID x 4 3/4" OD3/16" keyway
Case C21581Fits 200 and 400 seriesFor A belts3/4" ID x 4 1/4" OD3/16" keyway
CENTER SPINDLE SHAFT
Replaces (OEM):