Leaking lower mounting bolt at the compressor

Hi everyone. Hope someone can help. Just changed my air compressor, (Bendix 750) . It has an intermediate plate between the compressor and the mounting location. Caterpillar 6NZ. Everything went great except it's leaking at the lower mounting bolt. It's not coming from anywhere but the lower bolt. Could the intermediate plate be bad? I pulled it off and replaced the O rings again, but to no avail.

 

Never mind. Cracked compressor housing just above the bolt. New one installed, warranted the cracked one. Good to go. Mirrors work great when you can't see under and behind things. Everyone should have one in their toolbox.