I am currently turning an old farm building into a hangar and I'm looking to put interior sliding doors in.

All I'm looking for is one piece of cannonball round or some square/box style track that makes a 90 degree bend, anywhere in the 30" to 36" radius range.

I prefer the cannonball round, but I'll take square if thats all I can find!

Does anybody have any ideas or tips?

Thanks!