Projector Headlights

Can someone PLEASE explain to me how these are supposed to work? Last time I checked, my Focus uses one bulb per housing. It appears that these projector headlights use two bulbs per housing. Do you have to re-wire the harness or am I just seeing things? Thanks.

http://cgi.ebay.com/ebaymotors/00-04-Focus-Dual-Halo-Projector-Headlight-01-02-Black_W0QQcmdZViewItemQQcategoryZ33710QQitemZ80360 18121QQrdZ1

the projector headlights have an adapter that come with them that conects the 2 bulbs down to one plug to fit your car. if you look at other auctions you will see pictures of the back of these units and see the wireing.