Description Bonded lined brake disc. 6-1/2" x 3-1/2", 10 spline. Tractors: Hydro 70 & 86, 656, 664, 666, 686, 2656. Replaces 391445R91. This item is a suitable alternative for the following: 1975463C3AF, 391445R91, 753130, A714121, A-1975463C2, A1975463C2, S.61887, S61887