Looking for a WI-FI Card for an Alienware Aurora AA3795CSB

Does anyone know the part number of a 1505 PCIe WLAN card with draft 11n for an Alienware Aurora Desktop AA3795CSB (was sold by Wal Mart). The number I found, 1403-0637 for card plus antenna, doesn't show up anywhere in the Dell parts search. Or at least for me it didn't show up.

I was wondering if the Dell GW073 WLAN MX846 card would work but I'm not sure this part number supports 802-11n. I can pick one of those up at a pretty reasonable price. I also know the part number I could use for an antenna if this card would work.

Any suggestion would be greatly appreciated.