I do most of the service on my cars so when I bought my "S" [new] in 2004 I also bought the 2000-2004 S2000 Honda Service manual. In going through it I just happened to notice that those bolts were not metric. Thought it was strange and just always remembered.

 

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what I got from this thread is Bill just installed a racing harness

 

One less hole to drill in my S2k for 6 point harness install.

-Mike