My Phil freewheel hub will fit a 5 speed or an Ultra 6, but I can't get a 6 on it...
My touring wheel set, was built around a single threaded hubshell,
Type; Steel tube, aluminum hub flanges..
It Could have been remnants from a Front Hub , since Phil's Unique discs screwed on
(RH thread on left side, a brake tightens onto a RH thread)
I bought at a bike shop's garage sale, I shipped it down to PW Co.
and They pressed in the 126 long rear axle assembly , and shipped it back..
You could do the same.. send hub, (cheaper than whole wheel)
and ask for the width you need, they can put on new bearings at the same time..
..