Hi @brenick19097
Here's the [http://h10032.www1.hp.com/ctg/Manual/c06901257.pdf|maintenance and service guide] for the HP Chromebook x360 14a-ca0000 series, that should be applicable to your model as well.
Go to p.37 to view the procedure to remove/replace the display assembly. This will allow you to see how to remove the hinges.
The hinge part number (see Item #11 on p.15) is ''M15311-001.'' Search online for the ''part number only'' to find suppliers that suit you best. Just to verify the part number, it is the same number as shown in the [https://partsurfer.hp.com/partsurfer/?searchtext=18W55UA|parts list] for your exact model.