473845 136000. SIERRA 1500 PICKUP 19 new style (mirrors mount on door skin), w/high capacity air cleaner (opt K47). SIERRA 1500 PICKUP 20-21 w/high capacity air cleaner (opt K47), 4.3L. SIERRA 1500 PICKUP 20-25 w/high capacity air cleaner (opt K47), 5.3L.
