Blade shaft hub for lawn tractor mower mowers COMPATIBLE WITH 38" lawn tractor mower models from 1985 to 1991. CHARACTERISTICS: Overall height: 174.6 mm Height to flange: 54 mm Outside of large washer: 140 mm Width of flange: 57.2 mm Part No.: 30-505 Original part number reference: AM105891X , AM121687X VIKING