As several others have noted-the plastic clips attached to the prongs are reversed.You need to carefully remove then swap them, paying close attention to the orientation of each one. Then they will somewhat snap into the xB's bumper cover. But even then you may need to finagle the fitment so the plugs line up with the holes. You can tighten the lens body against the cover by 'righty tighty' on the Phillips head screw -the bottom prong.Switch does not appear to be lighted, and has no positive feel to it when engaging on or off. Still, not a bad price for the housing and provided bulbs. I upgraded to a yellow bulb (9006) for a bit more of a fog piercing look.UPDATE-as other reviewers have noted the WinJet provided switches are crap. The first one stuck in the ON position, I contacted Ebay and an entire new set of fog lights and switch were sent to me. The new switch worked for about 5 minutes then would not make electrical contact except for somewhere between the OFF and ON positions. I replaced with a toggle switch from an auto parts store-drilling out the Scion factory switch 'blank' to hold it in place.
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