If you are talking about the left/right mouse click, those are SW1 and SW2, which are OMRONs. If you are talking about the left/right tilt buttons that are SW8 and SW9, those are "standard" solderable tactile button switches that you can get from any maker shop. Tactile Button Switches: (1) Nice article about them in general: (1.1) Tactile Switch Basics (1.2) Tactile Switch 101 (2) I desoldered one for you and found it is made by Alps (2.1) L x W x H is 6.0mm x 6.0mm x 4.3mm (2.2) 0.98N, which is around 100 gf (2.3) Through hole, so easy to solder/desolder (2.4) No ground pin, (2.5) It is likely this model, or equivalent: SKHHAJA010 (2.6) Purchase from Mouser or anywhere else you happen to find it (3) There is no reason you have to get an Alps one. These are pretty common and you can get them from several manufacturers, so look around. Here is a CUI one that would work too. Be sure to not get any short terminals/legs (3.1)...