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I have also done this conversion but I had an easier time than Larry. The most difficult part of this project is connecting the unit's outputs to your OEM vents. That is easier if you have a late dash because you can use duct tubing to connect the defrost vents. With an early dash, you need to fabricate some sort of plenum. I also used a Restomod Air system but the one I used was shorter and had horizontal outlets, as opposed to the one Larry used that had vertical outlets. For me, the biggest challenge was the precise horizontal location of the unit itself. Since I did my conversion, Restomod Air has come out with a smaller unit than the one I used, called the Cyclone. It would be easier to mount than mine as the horizontal location would not be as important. As Larry mentioned, be prepared to fabricate mounting brackets and lots more. In my case, that meant fabricating adapters to connect duct hose to the vents in the front of the dash. With a late dash, no adapters are necessary to connect the defrost vents although I did use a 90 degree fitting from an end vent, on the center vent. With an early dash, I wonder if it might be easier if you used aftermarket defrost vents, that are designed to connect to 2" duct tubing? That probably means reupholstering your dash but it might save lots of time.    

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