Does anyone know the Bosch part number for a non-RPM limiting rotor, '73 3.0CS? (I.e. what looks like a regular old rotor.)I want to convert back to a points distributor -- have one -- but the rotor is broken and part of the number-bearing material gone. Might be able to get one locally if I had the part number. (How many different kinds of rotos can there be??)