Discovery 300 central locking question

Hi guys just want some advice pls. I have a disco 5 door 300 tdi m reg. The central lockings not working due to the drivers door actuator missing. I've already bought a wrong one. Just to clarify mines a square connector with what seems to be 4 wires coming out of the loom in the door ready to plug into an actuator. I don't know what the right one should be as I never had one in door when I bought it. Does a 4 wire sound right??? It's got six connections 2 of which seem blanket off. Mine also has a grey blipper for alarm with one button. Also if anyone has what I need I'm after one. Cheers wayne

i have the same problem have you sorted it yet