Good luck..... Most of the people who want to convert their NSXs to the newer lights don't do it because of the price. Your not gonna find them cheap (under $3000.00).
If your still curious, check SOS (Science of Speed). They have a update kit for the NSX. This is where we would look for updating our older NSXs, it's slightly cheaper then Honda, but the headlights are OEM. It will run you $3200.00
http://www.scienceofspeed.com/produc...ht_conversion/