I can't look up that part because I don't know what its official name would be. I suggest checking with Parts-People:Dell Inspiron 15 (7579) 2-in-1 Laptop Replacement Parts | Parts-People.com Send them an email with your query. Perhaps a photo of the part and description of the part and location would help.
 My Inspiron 15 7579 2-in-1 LCD rubber bumper is almost totally peeled off, exposing my screen. Please, how can I get it repaired ASAP?
Broken LCD rubber bumper