Motor mounts are on the motor. They reside between the motor and the frame.
Ha ha. Had to be a smart a$$.
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Take a look at Kandies pictures. You can see both of the mounts in the picture with teh engine out. You can see them when you are in the car though it isn't easy. I think you get a good veiw from the bottom.
They are kind of hard to tell that they are crack. Best way is to have some one rev the engine while you have your head in there with a flash light. Do be careful of spinning parts and long hair and lose clothing. Do I have a story on that one: when I was working as a student machine shop supervisor, and this kid came in with long hair didn't tie it up, working on the lathe... At least I wasn't working that day.
You can use FORD motor mounts instead of Nissan's. Same size less money. FAQ.