Seems you posted about this a while back.
Some answers in your old thread:
https://forums.macrumors.com/threads/810694/
Check my posts specifically.
I had actually purchased my wireless card from an Apple store for my 2008 Mac Pro. The numbers I posted are accurate.
If you like I could also take a pic of the box it came in, as I still have it. I believe that box had a part number on it also.
Here you go. I just took a pic of the label.
http://www.flickr.com/photos/psx1510/5530855092/in/set-72157626275856788/
Please note, that $43 was the retail price Apple was charging for the card in their store back in 2008. It's doubtful you can find the card for that price given the age and rarity of it.
so is this the only card that will work?
is it still fathomable to conceive that the way to install it is to disconnect the blue tooth cord and hook both up as described in the the mac rumors guides?
from my amateur understanding, the guide should work just fine. Both wi-fi and bluetooth use the same frequencies so the same antennas should all be interchangeable. Perhaps instead of labeling them 1, 2, 3, and bt, they could have labeled them front, back, top, or wherever it is that they go.