My wife needed to replace a burnt out driver's side headlight bulb on her Jeep, but we knew absolutely nothing about getting one changed out. So feeling empowered after watching a YouTube tutorial, we decided to stop at AutoZone to buy one. The kind and knowledgeable salesman showed us our options, and explained the differences between the various bulbs. We decided to then buy two, so we could upgrade the performance of our headlights. Not only did he take the time to help us choose a pair, but he installed them as well (only took 3 minutes)! The difference between the older and newer headlight bulbs, is 'night and day' (pardon the pun)!