Wind Rotor

Replacement Rotor - There are two different versions of the rotor.  The Original and the Gold version. 

Choose correct version by identifying if you have a gold paint mark on the rotor you are replacing.   If there is no paint mark, then it is the Original version.

If you lost the rotor, look at the main body of the wind sensor and see if it has a Silver (Original) or Gold (Gold version) small orientation mark on it.    Also, the screw in the body of the sensor will be silver or gold depending on version.