Electronics:

x6 30mm arcade buttons

x2 24mm arcade buttons

x1 Sanwa style joystick

x1 Joystick USB board with it's USB cable

You can find kits that include all of these parts on Amazon.

Screws:

x6 #8 Flathead 1" wood screws for holding the bottom plate

x4 small circuit board screws to hold the board

x4 M4 bolts and nuts to secure the joystick.