I make my selve a similar question if you find answer please send me a mail. I think you are talking about the one that is cooled by air, because there two tipes the other one is cooled by a jacket of watter this one you can find for 4BT called JWAC (jacket watter after cooler. But Im talking about the one cooled by watter that need to be instaled in front of the radiator, this using a common sense your dimension can be taked from similar diesel engines 3. 5 to 4L in toyota, kia, mazda or isuzu vehicles or trucks.