Hi,
The bezel is not shown as a separate part in the [http://h10032.www1.hp.com/ctg/Manual/c04807803|maintenance and service guide] for the laptop or even in the [https://partsurfer.hp.com/WSearch.aspx?Wchar=Y&searchText=HP+Spectre+13-4003dx|HP partsurfer] parts lists for the laptop, so I’m assuming that it comes as part of the display assembly.
Check if there is a part number stamped, embossed etc, anywhere on the bezel itself. If there is then search online using the number ''only'' to hopefully get a result for a supplier.