We developed these Cooler Ducts to perfectly fit certain coolers and allow you to efficiently duct cooling air to them no matter where they're mounted. This will open up options for you when you need to add a cooler for oil, differential or transmission, power steering, etc. This Duct's opening is 9.5" x 4.5". It has a .75" flange around the perimeter, making the total dimensions 11" x 6".
This duct was developed on the Derale 51606 heat exchanger, but will work with any heat exchanger of the same core size, such as the Setrab 50-616-7612 or Mocals 235mm wide 16 row.