One new old stock original Bosch brand ignition rotor, part number ZVVT9Z4 or 1.234.332.125.  This fits:

Saab 96GT & GT 850 08/1963 - 07/1965;  distributor number 0.231.120.023
Saab Monte Carlo 850 08/1965 - 07/1967;  distributor number 0.231.144.004
Saab 95 & 96 08/1964 - 07/1965 3 cylinder cars;  distributor number 0.231.144.002