I hope i can describe this in a way that people can understand

I have a classic impreza with the version 6 sti spoiler, the small part of the spoiler under the brake-light is made from wood/polystyrene, Im guessing this is not whats its supposed to be made from.
Due to the material its made from the paint is starting to flake off.

Can anyone tell me where i can buy just the small part for under the brake-light?

If this makes no sense i can put some pics up.
Cheers

 

use the wood to make a fibre glass mould type arrangement?

 

breakers yard?
ebay?