Blank Button Next to START/STOP OFF Button

I am just about to upgrade my 2014 Focus Sync 1 system to Sync 3.  I have seen in another thread that the blank button below the climate control has been used as a central locking button.  I have freed up the button so it now presses.  The PCB underneath as 2 spare connection points at pin 1 and pin 4.  PIN 4 makes a connection when the button is pressed so I plan on wiring this up to the Central Locking wire.  I need PCB pins to solder to the board but I have no idea what size would do the job.  They are pretty small to measure.  I know that the female end of the connectors are these: 1393367-1 Amp - Te Connectivity, Contact, AMP GET 0.64, Socket | Farnell UK but I can just use ones that are already in the socket but don't connect to anything and move it to the pin 4 position that is currently empty.

I see somebody on a previous post just used copper pins/wire but I will be honest and say I really have very little idea about this.  There is nothing else soldered to this side of the board.  I can see where the LED should go but it is just an empty space.  I would, ideally, like to wire an LED up in here too which lights when it is locked.  Again, I know what wires make this happen but I am not sure how to do this on the button.

This is where I have seen it done.

Not sure if something like this Connector 2.54mm Straight Male Row x 40Pin Copper PCB Connector Strip Header | eBay would do?

I hope this makes sense

Any help would be appreciated