You can get fiber washers to go between the metal standoffs and the motherboard, if you want. They're available from some hardware stores and probably at Radio Shack too. Normally they're not required. The motherboard is ordinarily installed directly to the metal studs (or spring clips in the case of an Enlight). The key thing is to make sure there are not any clips that don't correspond to a hole in the motherboard, since a stray one may indeed touch something it shouldn't.