Here are serveral pickup configurations that Fender builds, including left handed humbucker, and single setups. To see the wiring on the back of the pickguard just click the pickguard that you want and you will be taken to the page it is on. There you can see the how the pickups, tone knobs, volume knobs, and wires are put together.

SSS Standard Mexican Fender Stratocaster Pickguard	HSS Standard Mexican Fender Stratocaster Pickguard

Lefty SSS Standard Mexican Fender Stratocaster Pickguard	Lefty Deluxe SSS SCN with S1 Switch Fender Stratocaster Pickguard

Deluxe SSS SCN with S1 Switch Fender Stratocaster Pickguard	Custom Shop Classic SSS American Fender Stratocaster Pickguard