Regarding exterior colours, this is what the factory put out back in 1965:
1965 Bug colors
If the earlier suggestion - post# 140 were too much, you will find the interior colours corresponding to the exteriors in the web site.
Also here is another site with more colours but no interior colour guide
VW Colors (Colours), Volkswagen Paint Chips, Color codes
And here is a site that lists modern paint finish numbers for easy cross referencing
1965 Color Codes - Volkswagen Paint Cross-Reference
There is also the two tone option to consider:
Of course as you said the owner will have the final say. Who knows? Maybe Honda Habereno Red is specified by him/her 
Cheers