Just discovered the rotor mounting bracket is broken. FastLane is asking me what motor series I have. They are giving me four choices: 10-013206, 12-024478, 10-013205, or 12-024477. Where do I find that number on my car so that I can order the correct part? I know that my engine type is 103.942. Thanks for your help.

That is your VIN number right by the driver side windshield.

I would guess that they are looking for the engine number. This can be found from the chassis number but the engine number is stamped into the block below the alternator.