Dear friend, you have asked a question that I have been trying to find out myself. Have you tryed a dealership? My registration lists me as one model but my insurance lists me as another! (sorry about my lak of help, this is my first try)
Kia Sephias that were GS models had more options and the price tags during their sell were more than the other models. They had powered windows, some had powered mirrors, cruise control, techs were also in the instrument panels, some had rear spoilers on their deck lids, clocks came in them too, and some had sun roofs. But the engines were the same as all the other models. So if you have a GS, be happy cause your Kia came with more options! Enjoy...... LS models were very basic and then you have your RS, which were the middle class Kias.