Here is my current setup - I used a Derale oil cooler (DER-51610 at 6.8x13x2 inches). Made AN lines from stainless braided AN10, and welded a bracket up to attach the cooler to where the horns used to go. I moved the horns to the front.
I used some metal grating to make a cover for the cooler. Lots of trial and error fitting!
Horns relocated:
One of the brackets. I also mounted the cooler using some bent aluminum on the inside. I made some DIY rubber washers/insulators from some old radiator hose to isolate the cooler from some vibration.
Used two 90 degree fittings and two 90 degree tube swivel fittings. I did need to trim some of the plastic on the air tubes leading to the intake.
-Joe