I bought the switches shown at Aoyoho 15Pcs Off/ON Thread SPST Latching Type Push Button Switch and 5Pcs ON/ON 2 Position DPDT Toggle Switch: Amazon.com: Industrial & Scientific but I don't know the size of the terminals. The smallest size is 2.8mm. Is this what I need?
If you are looking on how to connect to them than most likely the easiest way is to solder to the connectors. There are special crimp plugs for them but they are a pain to crimp and to work with and need special crimping tool.
The switches are for a DIY 3D-prinnted flight yoke shown at DIY 3D Printed Flight Yoke for 2020 Microsoft Flight Simulator - YouTube