Name of (weird) part I'm trying to replace. Please help

Hello, I’m trying to replace a part on my macbook pro 2011. It is located at the back of the laptop, between the logic board and the screen hinge. I can only describe it as a “grid” where which the air flows out of the laptop. I think it serves as protection at the back of the laptop. Pictures attached for better reference. I have tried looking at videos of full teardowns of the MBP 2011 and I wasn’t able to find a single video where the part was there. Strange, but it fits perfectly on mine, but it is broken. I also went through every single spare part on this website related to the macbook pro 2011 and it wasn’t on the list. Could some please help me.

Thanks