almost ALL cases allow you to swap the I/O plate (input output plate) for VGA, sound, usb, etc inputs and outputs.
they are generally universal, even on propriety DELL motherboards. Propriety is a term for manufacturer specific parts (only DELL parts that fit in a DELL computer, for example). However, I have modded a few DELL and they even have a Universal I/O Plate!
not so much for the motherboard though, although I did get a uATX motherboard to fit in a fold-out Dell Dimension 8300 case. the fold out case now runs a quad core 3.0ghz AMD processor! with the stock PSU! lol