Try eBay. I’m looking for the lower right for my Roadster as my too has a crack.
You were extremely lucky! ..I figured a year of alerts on ebay was more than enough, even scrappers were charging so much at the time it made more sense to buy new, ..I remain aghast to this day, & realise why folk go early to auto jumbles & car boot salesI bought two complete rear 1/4 trims of the auction site ,they included the speaker grill and I trim I wanted ,just emoved them and now can do the modification I want they were £15 for the pair