Like soon2bedraggin said... different headlights with fog lights. HIDs were available on certain models i believe. The bumper is different also with fog light holes in the corners. Also, the grille shell was chrome. The headlights had 3 ovals in them, pretty tight if u ask me.
Dont know how to post a pic, but heres the link to a pic with a truck with the conversion on it.
http://img412.imageshack.us/img412/831/RCA_0012.jpg