So I called Apple and opened a case with them. They told me that the AirPort card is part of the motherboard and it's not a user-installable part, which is why there's no existing part number for it. So I hate to be the bearer of bad news, but it appears that this guide is either wrong, or is only for a Bluetooth card, as the screenshots in Step 4 do not match a MacBook Pro 15" Unibody mid-2009 2.53GHz w/ Anti-Glare (I can send you guys a picture of mine if you like).
If you take a look at Step 10 in MacBook Pro (15 Zoll, Mitte 2009, Unibody, 2,53 GHz) optisches Laufwerk tauschen, this is what the inside of my Mac looks like.
But according to Step 4 of this guide (MacBook Pro (15 Zoll, Mitte 2009, Unibody, 2,53 GHz) Bluetoothkarte austauschen), it should like this.
Both guides are apparently for the MacBook Pro 15" Unibody 2.53GHz mid-2009, however both guides have different screenshots. And the guide specifically for the AirPort card doesn't match what the inside of my Mac looks like.
I think something is amiss here. I definitely have a Model No. A1286, "MacBook Pro (15-inch, 2.53GHz, Mid 2009), Serial number: W8934S6N7XJ"--as verified by Apple's website, but my internals do not look like Step 4 above. Instead it looks more like Step 10 in MacBook Pro (15 Zoll, Mitte 2009, Unibody, 2,53 GHz) optisches Laufwerk tauschen.
Sobald er das hat, wird er in der Lage sein, eine Grafik zu seiner im Laufe der Zeit erlangten Reputation zu sehen.
Hier ist eine Vorschau, wie die Grafik aussehen wird:
Noch keine Reputation erlangt.