I assume you mean the connection on the back of the motherboard. These all use the same connectors, it is the same as used on wifi routers. Just search for wifi replacement antenna.
Your best option is to buy the ones that have longer wires and a small antenna stand that let you place the antenna on top of the case. Antenna on the back of the case tends to be blocked by the case.
But you likely will be fine with any 5db gain antennas connected directly.