There was a good article in SportsCar about seat back braces.

Any seat is legal if you install the rear brace. Only the FIA seats don't require a rear brace.

Not to give any particular company a plug, but here is one version:

http://www.ioportracing.com/Merchant2/merc...egory_Code=IOPP



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Tim Linerud
San Francisco Region SCCA
#95 GP Wabbit (Bent)
http://linerud.myvnc.com/racing/index.html