Master cylinder "gasket" to firewall with integrated bellows seal retainer.

Dana67Dart said

I would be tempted to put some form of sealer between the MC the plastic bellows holder and the plastic bellows holder and the firewall

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There's a foam gasket that goes between the master and the nylon plate but nothing between the plate and the firewall. I'll probably put something there even if it's just making my own gasket.