All the year's VW are on the Glasurit website:
http://coloronline.glasurit.com/index.php. It takes a bit of manoeuvring around to find the right colours and they are in German. Your Lotus White (Lotto Weiss) is L282.
From the Samba website it indicates that the colour of the 67 handbrake etc is L43 - a grey black (grau schwarz?). But the list is by chassis number so check it out.
http://www.thesamba.com/vw/archives/info/paintcodestype1.php
I too am researching the colours. Mine is a Lotus White 68. When pulling the body off the pan, the pan has lost its colour but the pan under the body gasket is a dark grey which I assume is the L43 grey black. It is definitely not black.
If you research the Glasurit site a bit more especially when you find the colour you want and then at the bottom of the page press next, you will get an exact colour mixture which I believe any good automotive paint company can match.