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Contact the folks in China that you bought it from. Take lots of pictures, showing what is supposed to fit, and where it is supposed to fit, and detail of why it doesn't fit. Sent it all to them. Many of these Chinese companies are very good at customer support.
Unless someone here has the very same kit, you are unlikely to find help here. That's why I'd recommend contacting the manufacturer.
Take it easy Dude...you can see the OP put Brabus"style" tips, not Brabus...smh
anyway, I believe these tips and brackets are for mounting to the stock diffuser and you clearly have the Brabus style C/F one. More than likely, you'll just have to go to am exhaust shop and have them weld the tips to you exhaust pipes in the correct position. Easy-peasy.
Good luck!
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Brabus style diffuser and exhaust tips
