I installed this seat back brace on my Camaro race car's Driver and Passenger seat (yes it came w/one) in order to take out guests during track days. It installed beautifully, it is adjustable after installation and it DOESN'T require welding. IO Port Number: Code: SBB15.
Its needed for any race car to pass tech unless you have an ultra high price Sparco seat meeting some secret handshake FIA standard.

I sold the car and kept this piece from the passenger seat.
100% intact and undamaged. Comes w/original instructions.
New price: $70 plus at least $10 S/H from California (maybe more depending on where you live) = $80+.
My price: $65 total cost. No shipping and handling.
Here's the IO port website:
http://www.ioportracing.com/Merchant2/merc...ategory_Code=IH
Here's an IO Port FAQ regarding the brace:
http://www.ioportracing.com/faq/seatbackbraces.htm
Steve