If I remember right, the last discussion on that topic ended with a
direct response from Howard saying there was no such rule or even
proposed rule.  I believe he said it was an oops in GRM.
John (Old Fartz & TLS #37) Lieberman
Ken & Kathy Lang wrote:
> 
> Has anyone heard the status of the rule where in order to use a harness you
> must install a roll bar?  There was talk of it previously, but at that
> time, it was not yet a rule.  Rule changes were not published in the latest
> issue of Sports Car.
> 
> I personally prefer a 5-point harness and would feel pretty uncomfortable
> not being able to use it.  The addition of a roll bar/cage not only puts a
> dent in the pocketbook, but adds extra weight.
 
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