I bought a used hub recently and it came with tapered bearing cones installed. Unfortunately I did not get the bearings with the hub.
The hub was for a 54 Chevy; 51 to 59, or something like that.
Both cones were made by Bower, a USA manufacturer; at least when these bearings were made.
Inner cone # LM48519 Bower
Outer cone # LM11918 Bower