The machining to install WR bearings into a standard 45 case is pretty straightforward. If you want to use sportster stuff you should use all ch stuff. I believe Frankenstein set up a bottom end with ch sprocket shaft bearings and shaft. If you are going to do machine work that would be the way to go. Trying to mate ch stuff to wr stuff is way too complicated. If you want to see what wr stuff looks like go to BOS (beautyofspeed.com) workshop section, bottom end, flywheels, crankpin and shaft gallery. I don't have any parts in my hand, but my memory tells me that the wr sprocket shaft is slightly smaller that 1" OD. Years ago I tried to use an early BT colony sprocket shaft seal in a handmade carrier for a wr. It worked but not great, not quite as tight as I wanted.