Eff Feb 2005, LAST YEAR, SCCA announced in the GCR (General Competition Rules)
that effective 2/5/2005, a minumum level of SIX point belts will be required in road-race cars, after the certification expires on belts made prior to that date.
So.... you can still buy 5-pt belts and use em where they are accepted, but if you try to pass tech in SCCA road race applications (Not Auto-X) then you need 6 or 7 or 8-point belts once belts built before 2/2005 expire (2 years)
Since FIA and SCCA are the leaders, expect others to follow.
(anyone who has compared the safety and car-control benefits of 6 vs. 5 knows why...so does anyone who has CRASHED, especially in a rollover)