A set was ordered for my 1967 Polara 500 convertible (742 rear end) and they have not yet been installed. The axles look great and come pre -installed with "Green" bearings and wheel studs. The cost was $325 with shipping although I am not all that far from Polson, MT.
I know that there are some questions about the durability of the sealed bearings but I have read lots of good stuff about them and they should work better than the factory adjustable bearings in my application since I have rear disc brakes. Also, they do not need adjusting which I have done lots of times but often was not really happy with the result..
I would assume that the green bearings could be removed and standard bearings installed if that was desired.
This is just as an FYI if anyone is looking for a set of axles.