Try this: 6mm x 6mm x 4.3mm (height) 2-pin microswitch. Check Reviews section for photos.

https://a.aliexpress.com/_mtHdF6K

Example from aliexpress:

6mm x 6mm square, 7.3mm high, 2-pin replacement mouse microswitches.

To replace the mouse microswitch, you'll need a solder sucker to remove the solder from the solder joint.

The PCB is single-sided, which is easier to de-solder compared to multi-layer PCBs