Scrappy, ebay, here. Or just take them out. The reason will be either
lowered car - CHECK
spacers - CHECK
or just taking corners too quickly -CHECK
They are only plastic. It will not affect the car.
They are rare, but TBH Toby, they will get knackered again very quickly with your check list.
Suggest if it bothers you about resale issues, look for a set when you want to sell. Don't bother now.
Try cliospares - they will be able to source you one I would imagine