Orson Have new sets of front hubs & due to the obsolete outer bearing this is re-specified with a larger Cup O/D to suit the new modified hubs. A point also to note is that the old specification bearings have a very thin wall on the cup & in the case of one of my old hubs the cup is severely cracked.
The bearings numbers for these new Orson Hubs is as follows-
Timken 21075/21212 & 14125a/14274, you will also need an oil seal which originally was felt face fitting, so you may need to check what is available.
I have provided this information to Orson to assist there customers.
This is following a request for information from them.
Robin