Hi,
Here’s the ifixit [guide|78738] guide.
This will help you to gain access to the LCD cover.
Here’s a link to a [https://www.asusparts.eu/en/asus/notebook/x-series|supplier] of Asus parts. Find and click on your ''exact'' model number and then under Product Category select ''Covers'' when the component options appear, to find the Asus part number for the LCD cover.
Once you have the part number, search online using the part number ''only'' in the search box of your browser'','' to find suppliers that suit you. Usually the part number is printed on the cover itself somewhere on the inside, if you wish to verify that you are ordering the correct part