precision 3640 bluetooth addition

I recently purchased a precision 3640 workstation without wireless support. I have now decided that I would like to add bluetooth to it. The service manual indicates that there is a "M.2 2230 PCIe x1 slot, keyed E for WiFi and Bluetooth card" slot on the system board.

Could anybody provide information on a card such as this? Either Dell or third party.

Thanks.