I bought a set of used 2003 Boxster S non-Litronic headlights from AD93 and all I can say is WOW! I installed them on the 996 and it looks like a new car. The original lights had yellowed and clouded so badly that it made the entire car look aged.
I plan to have my original set professionally refurbished to clear and then list them here on the Forum so someone else can bring back the youth in their lights and car (and get rid of that horrid yellow at the bottom!).
No need to label the "before" and "after" photos, easy to see the difference.