They are designed to fit together as 2 halves with 1.75mm filaments as the friction fit to hold them close.
Cell number has 4 digits, first 2 is the diameter and the last 2 is the thickness which means, Cells like 2016 and 2025 etc will fit the 2032 case.
Update 2022/11/14:
Make your own by editing the parameters on Onshape
Print with PLA+, .2mm 25% adaptive cubic with no supports.
The author hasn't provided the model origin yet.