Check the HP parts store - https://parts.hp.com/hppartsIGSO/Default.aspx?mscssid=&cc=GB&lang=EN&jumpid=[br]
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You’ll need the serial number of your HP laptop, and the screen assembly itself should have a part number. This ''might'' be printed on a little sticker somewhere in the machine, or will be available on the HP website. You can also use the part number as a keyword search on ebay (though I wouldn’t hold your breath). HP parts store is the safest bet.