Help Wanted to find friends from long ago

HELP WANTED: Looking for mates from long ago. Africa 1969 – in convoy with 3 English lads – David, Stewart, and Charles. Through the Congo, East Africa to Rhodesia.

We travelled together for several months, but never knew their family names. A late night border crossing between Zambia and Rhodesia split us apart, never to met again.

Any and all leads much appreciated:

Stewart and David