The Nismo one is no longer available I believe, but was made by "Erebuni" if I recall correctly. But I am not sure that they are still made either. You will have to look around and see what is available. You will have to fabricate your own duct work to the hubs and brakes. I suggest getting two three inch ducts to each brake/hub. Depending on the front air dam you find, you will have to figure out what works best for your set up.
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Tristan Smith
Buffalo's Southwest Cafe
ITA Nissan 240sx #56