The place to check for official Japanese Jamma cabinet pushbuttons and joysticks. In fact, they have replacement swithches and miscellaneous arcade parts. Also, they have the official VF4 sticks found on the Versus City cabinets found in Asia. Sanwa is for you if you prefer a round ball knob for your stick, convexed pushbuttons, and Japanese arcade controls.

Check Happ Controls if you want parts like the American cabinet pushbuttons and joysticks. They have a huge amount of arcade parts; pretty much everything you need to build your own arcade at home- sans the particle board. Happ Controls caters those preferring a bat-shaped knob, concaved pushbuttons, and American arcade controls.