Aspire E5-571p-55TLL, lost the blank disc reader -- wondering where can I get a new one.

I lost my blank disc reader slot -- the piece of plastic that replaces the disc reader for my laptop, and I'm wondering where can I get another one.

I don't need a new actual disc reader too.

If there's a part number, please help me find it and let me know where should I go to order that specific new part.

Thanks.