No offense man, but yours is 3x the cost as the one listed. I'm sure you get what you pay for in this case, but $3750 for a rear diffuser is almost out of this world. And I'm speaking from the standpoint of paying for carbon fiber Lotus parts, which are notoriously overpriced already. I can pick up a full set of CF diffusers, splitters and much of an interior for $4k - all made in the US and hand laid. I know you are charging a premium because is Tesla, but that's just simply crazzzzzy.
Don't get me wrong, I'm not knocking it - if the market bears that, by all means, charge that. But if that Aliexpress Chinese knockoff works and looks good and I were in the market for such, I'd definitely choose that. And a front diffuser. And a CF nose cone.