I have an electric rustler and need some screws for it. I was wanting to get some pretty ones like Trinity or Associated but they are standard and Traxxas uses metric. I figured out how to convert the length but have no idea about the diameter. Standard is something like 4-40 or 8-32 where metric is 3mm or 4mm. Does anyone know what size 4-40 or 8-32 is compared to millimeters?