A lot of manufactures build a standard loom for all the models in a particular range. This saves money on production and when people want to add extras on at the dealers as all they have to do is fit the bit and fit the switch not rip the whole car to pieces fitting wiring looms. Some other kit requires relays to be fitted too. E.G. All the fog light wiring is already in place even though most 850s didn't have them fitted in the early days. All you have to do is find the plugs and plug into the fog lights fit the switch and fit the relay. Cheers George