Any standard traverse carrier will work. Here's an Amazon link for some.

https://www.amazon.com/Graber-Traverse-Rod-Slides-Pack/dp/B01F80FXQW

You can also find the whole rod sets on amazon and other sites if you decide to replace.

It also looks like there's no string/cord in the rod. Without it you'll have to pull on the curtains to open/close. For the average person replacing the rod is the easier option instead of replacing the cord.