D2FC-F-7N (10M) micro switch commonly used as long as your mouse was used as a rectangular three-pin microswitch.

Life of 10 million times of clicks!

you can repair any mouse using this button like any Logitech 

Disclaimer: If your mouse has been in use for several years, you should seriously consider buying a replacement switch. I believe you could desolder the switch from the top by cutting it into pieces first (the plastic is rather soft)