Seriously off topic for an Aptera thread, but there's this:
https://vwparts.aircooled.net/Raby-s...01-p/11001.htm
Quote:
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In a regular shroud, one of the main difficulties is that the 3/4 side has a lot more fan exposed than the 1/2 side does. When developing this shroud, they "robbed" some of that excess air and duct it via that large hose, to the oil cooler. This helps prevent over-cooling the 3/4 side, and evens up the temperatures over the entire engine, while cooling the oil properly! Internal ducting is strategically placed to route air to the proper locations and velocities to deliver the most even engine temperatures possible.
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$$$$ but they are out of stock, not expected to return.