I would do a thorough search on the Internet and then a local search of your plumbing companies and Bed and Bath Stores.
If no avail, one can be nicely made to fit your situation very easily.
Are your walls on each side of the corner tile or drywall or just what?
A corner holder could be made to allow for a rod to drop in each side and look very good in the room.
After your search, come back with the composition of the walls and I will come up with some plans for this to happen.
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