I have the big bumpers from GSF. As said, all you need are the GTI ones, so that they come with the proper spliter, the indicatoer lenses of your choice, i think the looms as well... There are two types of GTi ones available though, basically you want the ones without the fog lights, as the fog light option only means that they have holes for the fogs, not fogs included, yet cost more :S At least, thats what i was told! If they come with fogs, then get them!
P.S, they fit fine...