Helz since when did Fiat leave the wiring already there? All SX's have part of the wiring, theres a piece missing between the two foglights. This bit of wiring only get power to the front of the car, the rest you need to buy.
In regards to the headlamp washers. Well you will need the windscreen washer bottle, as it contains two motors, again, you may need to do some rewiring as the wires will not be there for the second motor, then you will need all the pipework that goes to these headlamp washers, aswell as the headlamp washers themselves.
Would of been alot easier and cheaper to buy a HLX in the first place. An ELX is for the Brava.
Joske