I have a 2007 WK that didn't have projectors as an option, but I went ahead and purchased '08 style projector headlights and did a complete HID headlight upgrade.
I originally looked at aftermarket projectors but did not like the style of any of them so just bought the stock style through RockAuto.
I absolutely love the look of the projector housings and the light output of the HIDs is amazing.
2007 WK - Silver WK Club Member #71, 4.7L V8, 5 spd Auto, Autobot Decal (grfxedge.com), Aspen Creek Front Tow Shackles, Factory Tow Hitch
Check out more pictures and info here: www.mywk.tumblr.com