82 MB 300SD

I am having the same problem with the A/C only coming out of the defroster vents and I'm going to do the vacuum testing, but I also am going to replace the vacuum tubing for the system. Does anyone know the I/D and O/D so that I can order it?

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1987 MB 190E 2.3 16V- Name Pending
1982 MB 300SD -Old Blue
1965 Ford Mustang - Laura