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Perhaps, one additional consideration should be added to your comment: ... "just like the taypered bearing and holds the axle from coming out"....subject to the axial and radial load capabilities of the bearing....The snap ring keeps the bearing from going back into the housing. The outer part of the bearing is held in place by the backing plate just like the taypered bearing and holds the axle from coming out.
I'm not debating the reason for the substitution, apparently based on the inclusion of Willwood or equal rear caliper hardware, which requires the substitution, but on the MO400 bearing's longterm (L10 life) capabilities at imposed loads. I guess I'll just have to purchase one to obtain the manufacture's real part number to determine dimensions and loads...out of curiosity....just my opinion of course.
BOB RENTON