when i first inquired about the axle bearings that were in the dana for my humpback panel truck, i thought they had already been trashed because they were not a sealed bearing [open on the inboard side]. these came installed on the axles from strange, and the rear had never been run as it was a new , narrowed unit. the ends were the "big ford" bearing ends, i believe the od. is 3.150". anyway, i supplied the good doc with the part # on the bearings and several pics, and he told me those were for a 57 olds and they were the best a guy could get because they were open on the back side for using diff lube. however, they are not made any more or are very hard to obtain, i forget which. he told me at the time, which was at least 10 years or so ago. so, . i'll go with what he says and not worry about it. but my use is far from a serious cornering application.