Okay, I'm looking to upgrade to the brightest headlights option I can get for my '82 245 quad rectangle setup. I've been looking online at several conversion setups where you get these replacement housings that have glass or crystal lenses. I've also learned that you want to get the pigtail harnesses I believe because your stock wiring and plugs could melt from the heat that these things put off. First, who makes the best quality setup? Second, can someone explain the differences between all of these bulb options? Like H1, H2, H3, H4, etc. And my last question is that if my stock lowbeams are H4656 and my High beams are H4651 (or vice-versa), Then do I need 2 different bulbs/housings in the low and high beam positions? Does anyone here have experience with this? Thanks, Charles