[Onefast99gsx]

Ok, so i put a bunch of stuff back together on my car last night and most of the stuff that was laying on the floor to be put back on, is on. However i found this part laying on the ground. I have no clue what it is or where it goes and now it bothers me badly. It's about 1.25" long. It's a made of rubber and is hollow, rectangular shaped hole. Can anyone please help me ASAP?

Thank you.

**Edit**

Ok, let's try this instead. I resized the pic.

-Rocky