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The way understand it, you only need these things if you remove over 50% of the firewall....

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On all cars requiring a roll cage, if the OEM firewall has been
modified ( in excess of 1 square foot for transmission removal, not
including bolted in components) a lower windshield or dash bar of 1
1/4 x .058-inch 4130 chromoly or 1 1/4 x .118-inch mild steel is
mandatory connecting the forward cage supports

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