"Speaker replacement for - MDR-XB650BT"に関する回答eBay is a good first stop e.g. https://www.ebay.com/itm/SONY-Extra-Bass-MDR-XB650BT-OEM-Speakers-Cover-replacement-repair-part/113364539405?var=413617950633
"Speaker replacement for - MDR-XB650BT"に関する回答Video showing how to open up your headphones to get to the speakers. https://www.youtube.com/watch?v=MhsY_drT...
"How can I turn off or unfreeze my kindlke fire?"に関する回答My Paperwhite won’t charge or turn on. Sad.
"Trouble inserting new fan due to old metal part"に関する回答I would mount the new fan in the original metal part. If you can't get the screws to line up you could use really good glue to hold it. The Dollar Tree has really good contact cement if you live near one. As long as the fan can spin freely and it's near the original location you should be fine.