I decided to go with the GE nighthawk platinum's over the ultra stars since they don't last long for my 04 impala SS. I wanted to know what bulbs I needed for the headlights. it says low beam is 9006 and high is 9005, does that mean I need to buy 4 bulbs for the headlights ? Also I want them for my foglights which are 893's but I don't see them anywhere.