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In contrast, almost every time I sell set 7 bearings, the customer has installation questions/problems.

Probably because said customer makes a simple job a whole lot more complicated than it is. It isn't aero space science to pack and adjust a set of tapered bearings and rarely OEM were a problem. In fact I venture that the vast majority of 8 3/4 at a JY have never had a bearing failure and that they are still usable with no problems. It isn't as if you have to periodically readjust. Once properly greased &set up leave along for many thousand trouble free miles.
It is bound to be easier for you to install a set of greens on an axle and tell the customer to plug and play, no adjustment needed.