Bi-fold Shower Door Hardware Sources

Hello all!
I'm brand new here and looking for recommendations.
I have installed a brand new, gorgeous shower.
I want to use some antique doors in it. They're bi-fold, 1 5/8" thick. (Not here to debate the pros and cons of using these doors, thank you very much! ) The opening is will be 30".
I can find all the closet bi-fold hardware in the world, but there is no header to screw into.
I'm looking for a source for the track, which could be screwed in to either end.
I've looked at all the bi-fold doors available online, which helps me with what I actually need, but where to find it?
Any thoughts? Favorite vendors or fabricators?
TIA!

 

If you can't find what you need you can fabricate the track to match your door's hardware. Most are just a simple channel. You could rout slots into a nice piece of wood (teak, mahogany...) or find aluminum channel extrusion that will fit your hardware.