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Even though I can't see them, I'm going to guess those will take a real hunt to find. Watch eBay and Yahoo Auctions Japan, follow every Prelude related account you can find on social media, keep your ear to the ground... and you might find a set eventually.
I'm not sure if it can be done with 5th gen taillights, but for the 3rd gen there is at least one guy who has taken the red lenses off the outside. That looks pretty cool in the pics.
Last set I saw was maybe 2 years ago, and the guy was asking something ridiculous like $800 for the set. Although they were a genuine, high quality product that was available in Japan. Not sure if it was Stanley or Raybrig or whatever but it wasn't cheap aftermarket shit.