Wireless card for Dell Precision M4700

I have a Dell Precision M4700 laptop, service tag . I bought a Dell Wireless  380 Bluetooth 4.0 Module CN-3YX8R, but the cable end does not match the socket on the motherboard (see small vertical black socket JBT1 in photos). Strangely, there is a Bluetooth bay for this type card next to the battery and the card fits there. Just the cable is the issue. Am I missing something?

https://www.ebay.com/itm/For-Dell-Wireless-380-Bluetooth-4-0-Module-CN-3YX8R-Lat-E5420-E5520-E6430-3YX8R/292274034788?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

On further research, I discovered the WLAN mini-PCI card can be changed for one like this which contains dual band Wifi + Bluetooth 4.0. Here's one I located on eBay:

https://www.ebay.com/itm/Intel-7260-7260HMW-Dual-Band-867Mbps-Wireless-AC-Wifi-PCI-E-Network-Card-BT4-0/391352973818

This is what I currently have installed in the laptop, receives 2.4 & 5 gHz bands great, just no Bluetooth

https://www.ebay.com/itm/Intel-Centrino-Ultimate-N-6300-Wireless-Network-Card-633ANHMW-PD9633ANH/113694813606?epid=605654629&hash=item1a78bd2da6:g:69wAAOSwWbZclQdF&frcectupt=true

My goal is to add BT capability, as I have a portable BT speaker as well as BT headphones which I want to use. Would this card work properly for my laptop? I'm guessing this would be get the driver, then plug & play?

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???