Wireless card for Precision M4700 laptop

I have a Dell Precision M4700 laptop, service tag . I bought a Dell Wireless  380 Bluetooth 4.0 Module CN-3YX8R with cable from eBay. I confirmed this is the correct Bluetooth card for this laptop. However, the cable does not match the motherboard socket, it was slightly too long and looks different. Here's the listing:

On further research, I discovered there is a mini-PCI card which can be installed which contains dual band Wifi + Bluetooth 4.0. Here's one from I located on eBay:

Cable end does not match vertical black socket...or is this wrong location??? Hidden beneath something???

Dell 380 BT card and cable attached

Is the black vertical socket where the BT cable goes???