It's called a "double robe hook (chrome, round)" and you can get one from places that sell bathroom accessories, such as Wickes, Screwfix, Toolstation, IronmongeryDirect
If that particular range has been discontinued, you can search on ebay or get a similar, but not identical one, and change them both.
There are ranges sold under the "Swirl" or "Boston" or "Pendle" names that are similar
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