Welcome. While we have a lot of collectors here, finding old parts is usually a difficult task. Often most were depleted years ago and those that remained are usually kept by people for a worst case scenario. I usually try to be purist, but I've been hearing decent things about Revant lenses as the next best thing.
https://www.revantoptics.com/replacement-lenses-oakley-juliet
Emerald is a tough one since it wasn't really pure green like the modern Jade Lens.