MTD 683-0128B-0637 Pivot Bar Steel axle pivot bar assembly MTD original equipment part 90-day warranty for defects in material or workmanship Replaces 683-0128A-0691, 683-0128B-0498, 683-0128B-0691, 683-0128, 683-0128-0637, 683-0128A-0498 and 683-0128A-0637