A long shot I know, but I fought this might be one of the best places to look !!
A friend of mine is looking for a visor from an Arai Signet helmet, I believe it uses the same visor as the Giga 2, FV, Maverick and the FV2. It should if memory serves have the part number G2/3 Type stamped on them.
There about £30 on flebay, but he doesn’t come out too often so is hoping to get a second hand one cheaper with the odd scartch etc…
If anyones got one lying around, do please let me know and I’ll send over some money for it.