CyberFormula, I think you are misinterpreting the rules a bit. You do not HAVE to run an FIA seat. If you do have an FIA seat, it must be mounted according to the FIA's rules, and it does not need a back brace if it is either not on sliders or if it is on FIA sliders. If you have a non-FIA seat you must have a seat back brace no matter what. NASA enforces the FIA re-cerirtification on FIA seats (FIA seats more than five years old must be re-certified or run a SBB no matter what), while the SCCA is not enforcing the FIA re-certification (at this time, I'm sure they will eventually).
*We run sliders and a SBB in all of our cars. We have two pins we pull to adjust the SBB for each driver (allowing the seat to be moved forward and aft for driver preference). It's pretty easy to make the adjustments during a pit stop with a driver change.
The wording in the SCCA GCR (NASA GCR uses similar language, except they enforce and check FIA production/expiration dates)) definitely caused some concern for club racers.
New wording in red, below.
Quote:
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Originally Posted by SCCA GCR
9.3.41. SEATS
The driver’s seat shall be a one-piece bucket-type seat and shall be securely
mounted. The back of the seat shall be firmly attached to the
main roll hoop, or its cross bracing, so as to provide aft and lateral support.
Seats homologated to and mounted in accordance with FIA standard
8855-1999, or FIA.Standard.8862-2009 or higher need not have the seat
back attached to the roll structure. Seats with a back not attached to
the main roll hoop or its cross bracing may be mounted on runners only
if they were part of the FIA homologated seats assembly specified in an
FIA homologated race car. The homologation labels must be visible. Seat
supports shall be of the type listed on FIA technical list No.12 or No. 40
(lateral, bottom, etc). Passenger seat back–if a folding seat, it shall be
securely bolted or strapped in place.
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