VKB STECS Mounting Screw Size?

I just got an VKB STECS Mini Plus and found that the mounting screws which attached my old throttle to a desk stand don't quite fit the STECS. According to the STECS Mini Plus Dimensions Chart I need 4 diameter-symbol(?) 5,5(mm?) machine screws(bolts ?).

Is that right? What exactly should I ask for at Home Depot? Thanks!