Vacuum lines and Cruise

[tucsonjwt]

I am replacing the power brake booster and thought I would replace all of the vacuum lines inside the truck. I see one big vacuum line going from the servo to the cut out switch at the brake pedal arm.
But all I see for the HVAC controls are very small diameter color coded lines going to the various vacuum actuators and then one small line at the end of the run into the passenger side vacuum tank on the engine side of the firewall. Is that tiny line the source of vacuum for all of the other HVAC to vacuum actuators? Does anybody know where I can get those small diameter vacuum lines, much less color coded lines? Those small lines have special connectors at the ends to attach to the actuators and it looks like they are fused to the vacuum line, so I don't know if those lines are even replaceable.
I think I have a vacuum leak because the cruise control cuts out when I turn on the A/C.