DIY: GTR Clear Lenses Install
Probably because this forum's search engine can be iffy. I think theoretically people may have known this from 2009 as both cars existed since then.
Maybe the real weird thing is why Nissan did this in the first place. It's cheaper to share parts, unless the foggy clear version in the Z was sourced from a cheaper model already. But still. 11 years and they couldn't be bothered to update to something as simple as this.