Hiya goo and thx for the thread, sounds like owners of the night fission are pretty stoked on the product and response able customer service. A short visit to their website/store and looks like you can find a easy to use click and drop menu to see whats offered for your Gen 1. Read a little about product that was interesting. Scratched my head after reading in their blog."If our sights aren't glowing after 16 years,we'll replace them", combined with the first paragraph of their lifetime warranty,which states only green and yellow are afforded a 16yr warranty, 5yr on the other colors. So the more correct ad should read if our sights aren't glowing after 16 years,we'll replace them,just as soon as you order and pay for another set. Cheers Be well.