Are the 3 point hitch parts interchangeable between the 960 and 990? Manuals show that the draft bar connects differently between the two models, but the parts look the same. The 960 looks like it attaches to be bottom of rear frame plate assembly, while the 990 attaches to the rear axle houseing. The part numbers are nearly identical, 438-985/986 (960) and 438-10985/10986 (990). The lift pull rods part numbers are different; 438-10923 (960) vs 438-10729(990), maybe the lift pull rods are different lengths?