I am doing a vintage rebuild of a Mac Pro early 2009 model (MacPro4,1) and want to use ONLY the stock model of all component parts. I am having trouble finding the exact model of the AirPort card sold by Apple when MacPro4,1 was released. Some references I found said that the AirPort card was installed by default in all MacPro4,1. Other references I found said that the card is an optional part. Which is correct? Regardless, can someone please tell me the EXACT PART NUMBER / MODEL NUMBER of this card so that I can source eBay or elsewhere to find this exact card (again, don't want any older or newer version, only the actual version that Apple put into the MacPro4,1)?