ebay flog quite a few

then get the actuall proper wiring plug in harness for the car from sone of the big manufactueres for around £50, literaly plug and play with one or 2 holes to be made in the plastic under tray of the bumper for the wires and plate to go through and it's done

took me about 3 hours all in to bolt up and wire in

you only need 6 bolts, but make sure they come with the kit, they bolt into the holes in the chassis rails at the back
you just need to remove the rear bumper and some of the panels in the back to get everything where you can see it, plus you need to drop the exhaust o gain access to 2 of the bolt hole locations but if you have a degree of mechanical ability it's easy, you dno't even need a jack

ask away if you need any pointers