So I am looking to order an auto dimming mirror for my 2004 WRX wagon. I figured it would be pretty straight forward, but I keep getting different part numbers that seem to be compatible. I first went to subarugenuineparts.com and go the part # H501SSA100, and then I called the dealership and got the part # H501SSA000. Has anyone purchased and installed an auto dimming/compass mirror on an 04? If so, can you give me the part # that you ordered and will fit exactly? Thanks in advance....