Yeah, what they said...  I had the same thing happen to me too. Found out it actually ripped the weld nut up through the floor on the front left bolt and when I fixed that I found out that both of my seat rails were broken on 2 or 3 places, so welded them and then discovered my floor pan was torn under the rear seat mounting point. I ended up installing subframe connectors with the seat support (Kenny Brown Super subs) since my old BBK ones didn't have that, and a floor pan reinforcement plate and welding everything back up. SOOO guess I am saying check it all out while you are at it and take the necessary steps to fix/prevent these same problems. Good luck! 
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92GT Lowered with Ebiach's and Koni's, Kenny Brown subframe connectors, lower G-brace and jacking rails. BBK upper and lower control arms, polyurethane bushings all around and Ken Bell blower, ram-air, 80mm mass air, SMC Alky Injection kit, J&S Knock Gaurd, TwEECer RT and a bunch of other stuff!
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