you have an OEM system and there is no guarantee that its case conforms to industry standards and will fit a standard motherboard. but you can still try... what is the current configuration of your system?
Biostar makes a motherboard that is almost an identical replacement for the Imperial board. It is the P4M80-M4. Removing the pin adapter from the front panel connector leaves a ten pin adapter that perfectly fits the Biostar motherboard. The board even is an exact fit for the I/O shield.