L.H. Lower lift arm 33-1/2 X 5/8 inch thick, CAT I and 1-1/8 inch on tractor end. For Massey tractor models: MF135 230, 235, 245

RH Lift arm end CAT I 1-1/8 inch pivot bushing hole for 100,200 and some 300 series MF tractors

LH Lift arm end CAT I 1-1/8 inch pivot bushing hole for 100,200 and some 300 series MF tractors