ATM - These threads might be the answer(s) you're looking for:
[1] Plastic fade
[2] Price of plastics? (2017 DS)
[3] 2015 SR plastic body work colour fade
-and- Maybe this resource:
Zero Unofficial Service Manual
(
https://zeromanual.com/index.php/Main_Page)
Mine is red and now fading to an ugly dull orange.
I'll be painting it soon because of the fade and scratching.