Hi Bruce,
Firstly thanks for updating us with that info. It will be very interesting to see if the parts are all interchangeable.
I don't know what sort of idiot would pay $64 for a low tolerance bearing, but yes they are out there and I seem to not be able to find them. All I ever do is find the smart buggers that want to screw you down, but that's South Australia for ya !
Cheers,
BB.