The McCormick 6621311A3 Support is an authentic OEM component designed for various McCormick MC Series tractors. This critical part ensures proper structural integrity and function within the specified machinery. It is compatible with McCormick models MC100, MC105, MC110, MC115, MC120, MC130, and MC135. This support is also cross-referenced as an equivalent OEM part for Case IH and Landini models, sharing the same part number 6621311A3, indicating commonality across brands within the same manufacturing group.