Not true with GM C-clip axles. They do not have an inner race, the rollers ride directly on a surface hardened part of the axle shaft itself.
I've not had an LC SF axle opened up, so I don't know what I'll find there. Time to search 'Mud.
EDIT:
As best as I can tell from the FSM the bearings do ride directly on the axle shaft. The bearing R&R section shows the bearings being installed into the housing (and illustrates the bearings with no inner races), and then axle is installed into the housing.
Oh well, I want a floater anyway - this just pushes that purchase further up the schedule.