This SSD enclosure fits a standard-size SSD with the Sabrent low-profile USB 3.0 Adapter - I have used the Kingston A400 SSD.
For assembly, this relies on a close fit. You can secure the SSD to the base with 4 M3 4mm countersunk screws, but it is not necessary as the fit is snug.
The print in the photos is from an A1 Mini.
The adapter is available here: https://www.amazon.co.uk/SABRENT-transfer-Converter-Compatible-EC-SSHD-Black/dp/B011M8YACM/
Kingston A400 drives are available here: https://www.amazon.co.uk/Kingston-A400-Solid-State-Drive/dp/B079XC5PVV/