Hello. I have an issue with my truck, and need help identifying a part. I believe my transmission fluid is low, ans unfortunately I had to force my truck to shift into park this morning. As a result, a small piece of metal kind of like a staple fell out of my driver side dash from somewhere, I'm not entirely sure where. Any help and advice would be appreciated.

The truck is a 2004 GMC Sierra 2500HD with a 6.6L Turbo Diesel Engine with 4WD.