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go to advanced auto website they have different sizes you can order thru a store. find your diameter size they come in 4ft lenths i think. thats where i bought my duct for 65 cutlass ac.
Same here, got the rubber hose at NAPA. Have never found the rectangular stuff, so I used silver ducting from Home Depot (I think it's for a dryer, as in washer and dryer), and used, of course, duct tape to hold it in place.