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Guys I had deleted my Smog Pump along time ago as well as had the PCM reprogrammed for it but never took off the aluminum crossover tube from one side exhaust manifold to the other. Since I recently rebuilt the motor and put it back in I want to go ahead and plug the exhaust manifolds where the tubes screwed into. So my question is where can I purchase the large Bolts to plug the exhaust manifolds? I know NAISSO superstore used to sell them but I looked and couldnt find them there. Where can I buy these? Thx Steve