Do you have a right hand drive truck? That is the only way I can make sense of that picture...
That picture is an example, from my Model A roadster, of a plastic reservoir so you can see the level at a glance. There is no rule book that says you have to use an integrated metal bowl master. That type of master would work under the floor of a truck, inside the firewall of a truck, or on the firewall in the engine compartment. It just so happens I wanted a clean firewall on my Roadster, so the assembly went inside my cowl. Everything is a tight fit, but doable. If anyone wishes, I have 2-3 examples around here of a remote reservoir, master cylinder systems.
My '51 has a hanging pedal system with a master in the engine compartment.
I've done the OEM master location before and I'm no longer a fan of it.
