Try Stallion Customs

 

Try eBay searching "H2 Hummer light bar lens 2006", Rock Auto's body/lighting section, or Hummer Forums like hummer.net where members part out trucks regularly. Facebook Marketplace Hummer groups are also worth checking, and LKQ or Pick n Pull salvage yards often have H2s. If all else fails, a local plastic fabricator can cut a replacement from clear acrylic for cheap. If you're upgrading while you're at it, many Hummer EV Lightbar setups are also compatible with older H2 mounting points.