My sierra has the W/T large retangular headlights on it at the moment...i would like to swap out to the quad lights (not the composites). What is all needed to swap to that style light? Just the wiring harness and the light assemblies along with the grille and new signals/markers? I have yet to see any GMCs with the 94-98 grille and the quads im thinking it would look pretty good actually especially if billet grilles are fitted over the headlights and black out covers are fitted over the signals..