Several Airtours 707s were assigned to the Air Mauritius contract over time, painted and titled to a greater or lesser extent. When one needed a major check another was prepared to take over, plus occasional one-off substitutes by the rest of the fleet were done as required. My records show :
ARRC November 1976 to March 1977 (including the Australia flights mentioned above)
(various main fleet) - April 1977 to September 1977
APFD - October 1977 to May 1979
ARWD - May 1979 to April 1981
In April 1981 the contract passed to South African Airways, who provided 707-320B ZS-SAD in a similar manner for some years.