They were kitted together and not constructed as an assembly. Not likely the factory would have done that but most likely rails were swapped; intentionally or not. It could have been the table was in a pool hall and when they recovered the tables, they did the rails from all tables at once and...
If you are on Facebook, there is a Brunswick Gold Crown and Centennial Group. Some members have many Gold Crown parts. I'd wager if you posted there someone will have one of the feet. My Gold Crown I has the same feet and mine were in pretty rough shape too.
I know this thread is about 'bushkas, but there's no telling what this could fetch. Mosconi's 526 Rambow from the Glenn Collection.
Yours truly holding a piece of billiards history.
I would ask him what he is planning to do with regard to the cushion replacement. If you don't like the answer, you couldl always ship the rails to a mechanic familiar with the process. Where are you located?