These can be found on Amazon at this webpage.
My original speaker covers under the rear window of my 2003 Toyota Camry disintegrated years ago.
I’ve seen most other Camry’s of that vintage have the same problem – -my observant older brother noticed that as well, came upon these speaker covers, and gave them to me this Christmas.
My Camry has just under 140,000 miles on it. I plan on driving it many more years . . .