Apparently this version is really successful fake controller, hence the differences. I used Xbox 360/PS2 analog and replaced the push button of correct size (way smaller). Had to create holes in plastic for button legs but it works. Cost was under 2$, button were actually more expensive (1$) as I had to order at least 10. My original idea was to use inside of new PS2 analog and replace the original one, but dont remember why it was not feasible.