The ONLY thing I can come up with (car related anyway) is some kind of dust cover or similar thing for the shifter linkage where it meets the transmission... but probably not, especially being hard plastic. I don't know what your car looks like down there so I'm basically just making shit up. Whatever the case, stuff like that (small, threads are molded into the plastic, etc. Means its not designed to hold up to stress) generally aren't critical components. I wouldn't worry about it, car part or not.