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You need  a standard 2.5" SATA SSD - any will work.  Note that you may need a spacer to mount the drive, which will be slimmer than the 9.5 mm drive this system is designed to take.

https://www.cdw.com/product/edge-7mm-to-9.5mm-ssd-spacer-adapter-for-2.5-drives/3817225