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
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)