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I have an extra set of "custom" spindle ducts that me and a buddy made following a similar design to some of the name brands (Quantum, etc.). All aluminum with high temp duct hose. These will require some enlargement of the tube opening on the aluminum spindle piece, which I can explain further through PM or email if interested. I did not have to modify the plastic inlet duct, other than adding the three holes for that plate to bolt to.