Dell Latitude X300 - Manual (Page 101)

10. Connect the antenna cable to the antenna connector on the Mini PCI card.
11. Lower the Mini PCI card toward the inner tabs to approximately a 20-degree angle.
12. Continue lowering the Mini PCI card until it snaps into the inner tabs of the connector.
13. Replace the cover and tighten the screws.
1 connector
2 Mini PCI card
NOTICE: The connectors are keyed for correct insertion. If you feel resistance, check the connectors and realign the card.
1 cable connector (2)