I guess Datsun and other technicians in the states thought they were smarter than the engineers back in Japan. Engineers don't strap on stuff with no purpose. Engineers are not trained to add gimics. If you see gimics, that's the marketing executives forcing engineers to put them on. Trust me, I know. That pan was there for a good reason, and so was the fan cowl on the radiator. The buffeting of air flow under the radiator fan blade area is disruptive to the airflow the cools the radiator. Turbulence is undesireable. But who can convince some of these automotive technicians who want to play automotive design engineer? I have one that I purchased from someone, but have not installed it yet. I did put a ton of paint on it. Tomohawk, have you held one of these pans in your hands. I'll tell you that this is a very complex sheetmetal stamping. I started taking measurements to make a pattern and gave up, and I'm an engineer. You might be able with much time to make a primitive one. I'll say it again, this stamping is VERY complex.