Vacuum Hose Installation Questions

[ea6driver]

I'm replacing all the vacuum hoses in my '78Z. The FSM is very helpful for showing what components attach to the ends of all the the hoses, but I'm having a litttle trouble trying to figure out how to route the hoses in the engine compartment.

Two of the vacuum hoses attach to the intake manifold and run aft then along the top of the firewall (with 3 plastic clips) over to the passenger side where they (and a third hose coming out of the firewall) then run forward to the magnetic valve assembly and vacuum tank.

This last part of the run is where I'm not too sure of the routing. In the FSM there is a diagram that shows these 3 hoses running forward and attaching to the engine bay with 3 more clips. I can't find these clips in my car, and I don't want to just leave the hoses dangling in the air.

If you've got a 280Z with the stock vacuum hose configuration could you please post a few photos showing exactly how these vacuum hoses attach in the engine bay for this last part of their run forward?

Two other short questions:

What is the size of the vacum hoses? I'm thinking about ordering some silicone vacuum hoses online and just want to be sure to order the correct size.

Where can I get a replacement OEM one-way vacuum check valve (the black circular one that installs into the lower hole of the magnet valve assembly)?

Thanks in advance.