S-H safety harness (V2C)

I wandered around the web sites for Schroft, Gadringer, Davis and
Pacific Scientific today. For aircraft, they only appear to offer 3, 4
or 5 point harnesses. None of them offered 6 point harnesses for
aircraft. Schroft does indeed make 6 point harnesses, but these
harnesses are intended for motor racing and only carry FAI
certification, not LBA or FAA certification.

Wouldn't it be a violation (in the USA) of some FAR to fly a type
certificated aircraft with a safety harness that didn't carry either
FAA or LBA certification?

-John