I seem to remember reading a discussion about adding/clarifying a rule about having to use a seat-back brace to the cage on FIA homologated seats.

Not sure if this was on the forum or in the club meeting minutes - but, as memory serves the idea was that if an FIA homolgated seat was over 5 years old that it would require a seat-back brace.  I believe this was to come into affect for the beginning of next season.

Anyone remember the details?  Did I remember correctly?

Cheers,
Darwin.

The FIA seats certified to the 8855-1999 have 5 year lifespan. If the seat is past 5 years from when it was made then you could send it back to its maker for re-certification for 2 years, buy a new seat or attach the seat back to the roll cage. If your seat is certified to the FIA standard 8862-2009 then it is good for 10 years.
See the FIA website for all the info. I urge all racers to buy the best safety equipment. The FIA stuff costs money, but is likely tested to a higher standard. How much is your body and its parts worth?