Looking for a Fresh Air Intake Hose / Duct 1971 CJ5

I'm looking for a fresh air intake hose/duct that runs from the grille to the heater on a 1971 CJ-5. several posts mention that it can be found at J C Whitneys. However, I searched the website and also spoke to a J C Whiteys Rep. yesterday, and the largest they carry is a 3" diameter. The duct required for the CJ is 4.5" diameter.

Does anyone have any other leads on where I might find the correct size part?

 

Got mine here: http://www.walcks4wd.com/product.aspx?pid=3567

Not cheap but the right part.

 

Thanks, I just ordered one!