Plus2 dash vent ducting

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I am looking for the ducting that goes between the heater and the dash vents on a 72/73 Plus 2. The existing white dryer duct and tape to secure are more of bodge than I can stand.

[Bud English]

Rob,
Ray at R.D. enterprises has three different diameters of that ducting. I don't recall which one is needed and the parts list is no help at all. If you have it apart I'm guessing you know the size.
Bud

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Thanks Bud, it is getting closer to road worthy. Just a few small details to work out.