I bought a pair of headlight bulbs for the Insight. They are supposed to burn in a bright whitish blue range (I've yet to replace them). I went to E-bay and punched in all Honda Insight accessories and a variety of items come up (headlights / car covers / floor mats / seat covers / window glazing etc.) I've also ordered a custom fit car cover - extreme weather - sun/marine - waiting for it to arrive. There is also a company on Google that has various after market fog / off road lights for the Insight as well as racing accessories. Many other companies have other accessories. Punch in Honda Insight.
I just punched in Honda Insight Accessories into Google and it is on the first page. The third company down: autoanything.com - There are plenty of others too. I don't know if I missed your question. Perhaps the company listed items for the Insight mistakenly but it says for the Honda Insight. The direct link is as follows:
Yes, I saw the off road parts that simply didn't make sense. But have you tried finding out about the headlights? They had things for the Insight in there. It may be a search engine listing improvement technique to list other things. You are interested in headlights. Do you mean the bulbs or the whole unit. Ones that don't fit flush? A different beam pattern? After market add ons with your headlights? Just a brighter bulb I got from E-bay. Personally, I like the headlights stock. I just wanted an opportunity to test the supposedly blueish-white light blubs when the originals burn out.
These replacement bulbs are what I've "upgraded" to also. Available at any auto parts store, maybe even in the Wal-Mart auto section. If your wanting a different "style" lens assembly then see Ricky's reply above.