<VV> vacuum tube for CORSA dash

[rich dixon]

Can someone tell me what is the proper size of the plastic vacuum line that's used on the Corsainstrument panel? I am installing a Corsa Instrument Panel in my  '66 Monza and looking for some info on the line size used and where I could find this to purchase.

I assume this lines runs the entire length of the car from engine to the IP.

Thanks for the help. 

RD