Rectifiers usually only have minor technical differences between them. Regulators are a different story. Combined units also tend to be for specific applications (but not always).
In the case listed above, the 6V regulator will regulate the DC system voltage to 6V while the 12V will regulate to 12V.
The wattage listed on each is how much power it can handle before it gives up the ghost.
Also, for those mounting tabs on the side case... Make sure you mill the correct three, otherwise your stator cover will have to be mounted at an angle.
In the case listed above, the 6V regulator will regulate the DC system voltage to 6V while the 12V will regulate to 12V.
The wattage listed on each is how much power it can handle before it gives up the ghost.
Also, for those mounting tabs on the side case... Make sure you mill the correct three, otherwise your stator cover will have to be mounted at an angle.