You can either check on service centers or **********.com
A l i e*xp ress .com
From my experience, please don't buy from any third party vendors. Buy it from a oneplus service center as the original sim tray includes a water proofing rubber seal which helps in avoiding water going inside the phone making it safe when it's accidentally dropped inside water. The third party tray would not have seals upto that quality which originals would be having.
Get a normal one from a local shop
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