If it has central locking i'd imagine you'd only need one actuator and a receiver for it? Think they'll only need a live and ground, and the actuator will plug into the receiver. I've got a kit that i was going to fit into my old megane, and then into the Mk3 as it came with no fob, but found a remote for me ancient alarm system! Mine was a £25 ebay job, and to be honest, feels as cheap as it was!
Is it just central locking, or was it Remote, but the fobs been lost?