Hi David, I have a copy of AGCO's cd from year 2000, hence the upgraded numbers. The shear tube you mentioned 1860 189 M1 is a superseded part to 1871 925 M1. Not sure about the varying lengths though? I never take it as gospel, that the info in the after-market catalogues is correct. Have found a few flaws in the details on some parts before, believe me! 880069M2 fits 135, 148 and 165, by the info on the disc. But, as you say too much variation to be the problem. The earlier pinion nut with tab is interesting though, as the upgraded models with "wet" brakes all had the later, shallower "pinned" nut fitted. Could the back end be different in some way? Good luck, Evan.
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