Looking at some low mileage cars from 68 I can only offer the following
Tube and holder - Tube has that coating on it like the brake and fuel lines. Might be able to fake it with zinc and dull it down from there. Holder appears to have been bare steel since in the pictures it rusted while none of the other items did - IMHO eliminating zinc and P&O
Vaccum line retainer - P&O
Speedo cable retainer - Zinc
Kick down arm - P&O
Hope this helps