Ken,
The ducts are about $25 each from a local performance shop....they have a clear style and a black style to use with 3" hose. The hose is a flexible vinyl tubing that will not collapse so I don't see why you could not use it with your pop outs.
I'm not sure about making the cutout in glass, so I'll go with lexan quarter windows. The style I'm looking for is pop riveted to the quarter window.
Sandeep
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