No offense but my brain nearly imploded while re-reading your post 5 times to see what you were asking

Anyway T/A factory headlights are sealed units, you can't just replace the bulbs without expensive after market kits. Personally I'd love to upgrade to 1 of these kits myself but the cost is a little staggering. The factory headlamps aren't really yellow, at least they aren't *suppose* to be. They just get that way after 10 years. Just replace the sealed units, you can buy them at Walmart even, and it only takes 5 seconds. Or you could buy some of the spray stuff they have for removing the yellow, theres some that work okay with minimal effort and some elbow grease but on factory units I think that would be a huge waste of time.