A year or so ago, someone posted a list of most of the popular racing fluids. IIRC, the Ford HD had the exact same specs as Motul 550, and was rumored to be the same stuff. I've also heard the Wilwood 550 was the same alos, but have never seen or used it. I use the ATE as it lets me use the two different colors, so it's easy to see when the system has been fully bled. Don't know if Ford's changed their stuff or not.

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MARRS #25 ITB Rabbit GTI (sold) | MARRS #25 HProd Rabbit
SCCA 279608