In the shop I worked in a couple years ago they were repairing one of the lathes, a 16x30 Lodge & Shipley from the late 50's early 60's, same as the one I have at home now.. The Timken spindle bearings were made to order for several thousand $ and the lathe was out of commission for 4-6 months waiting for them..
I expect if you want a bearing bad enough you can have it made.
Grigg