I purchased a Broadcom BCM94321MC mini-PCI card from a Dell laptop (same as the one in the 802.11b/g/n iMac 5,1) for my iMac last night. The 4,1 only comes with one Wi-Fi antenna. The iMac 5,1 has a left and right antenna. My question: Which one do I need to complete the set in my iMac? The left or right? I don't want to have to take my iMac apart just to find it out the hard way if someone knows, I hope! Thank you!