Good to hear that this has helped.
It’s only a vacuum hose so I would look for:
-the straw from a wd40 bottle or similar, there might be different sizes available
-the straw inside a spray bottle might be a bit large or perfect
-a 2mm hose connector
-very tiny brass tubing
-crazy glue on fresh straight cuts
-old expansion valves or mechanical oil gauges
-snip off a small bit of the tubing behind the RH footwell vent panel
The vacuum hose should pass into the car where the hole for the steering is, that is, on the passenger side. I could be wrong. Better to work with what you have.
David