Looking for racing gt rear spoiler for E60 M5

I am looking for a GT typr racing rear spoiler for the E60 M5 that looks like the liberty walk rear spoiler for the Nissan GTR

http://ift.tt/1O97Wv7

and also more pictures here http://ift.tt/1O97TPT

Where can i get something like that?

Thanks

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Looking for racing gt rear spoiler for E60 M5