I have a poly rear diffuser for sale. Never installed, decided to go a different route. Located in San Diego area. Just trying to get what I paid for it. Got it off a guy on offerup. $220.00

 

Just wanted to add some details.
This diffuser is designed to fit Euro-type license plates (short and wide vs the USDM tall and narrow).
This also will match the 07-09 rear bumpers better because the 2010 and newer have the wider cut design and will stick out on the bottom outside of the diffuser.
Trimming and modification is required to make this diffuser it. I am not sure how much is needed.

not my car, but a reference for those interested in purchasing