Old Air Product with billet firewall bulkhead connector

[wHATANERD]

Hello, I've ordered an Old Air Product A/C system for my 69, it's the one that allows you to use a billet firewall bulkhead, however I'm having difficulty figuring out how to install the unit inside th cab, and where to mount the bulkhead to get the lines through the firewall. It would be very appreciated if anyone who has done could post some pictures of there setup. Thanks