In regards to the seat bracket material I can only offer one personal story that will drive my choices when it comes to seat brackets or adapters. A friend of mine was killed in 2004 when the drivers seat brackets ripped away from the floor in a highway-speed accident. From what I know, it was a Chevy cavalier, not modified in any way. He was thrown from the vehicle.
Since that happened, I've always been a bit paranoid about "custom" seat mounting brackets, especially DIY. I would always overbuild this part of your car. But I get that I may be more sensitive to the situation than most.
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Jeff: Project "Rolling Mockup" 69 Camaro SS, AFX, TKO600, Baer GT, etc
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