Neither... According to the manual, it's called 'waterfall light shield'. That's the metal part that sits in front of the lights so you don't see them flashing on the topper. I've got the clear topper cover and a repo topper. I'm looking forward to getting one of twisted pins toppers so I can finally have the waterfall effect
My original post though was wondering who all was missing the metal piece...I can't seem to find one anywhere, and if its just me that's missing that infernal part, it would explain why no one makes the replacement anymore.