I was fooling around with Rhino and I came up with this
rad ducting. My guess is the 4.5" by 19.5" by 2" thick
stock oil cooler will require a 5.5 inch diameter opening. 
So I divided the intake into two parts.

Rhino has this neat feature where you can have two axis
not necessarily in the same plane or angle and it can "blend"
the two center lines. It will then construct a "pipe" with
that curve as its center line. I used those features
to do the oil rad ducting. Perhaps someone can find 5.5 inch
flex ducting. I see ACS has 5 inch and six inch. 
I guess six inch will fit.

Putting the oil rad here with louvers for the outlet air 
keeps the oil line plumbing short.

Paul Lamar
 
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