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Well, you can't really buy the rigid disk in a rectangular shape. There are piezoelectric "flaps" or "sheets" that you can buy, but I think you may find them to be challenging to apply as used in this instructable. They're also usually pricey as they're typically used for more sensor-like applications.
Hello! I have updated the instructable. The files you're looking for are now attached to the last step. If you'd like any of the other files (STLs, reference materials, etc.), comment back here and I'll get those to you.Happy building!Ryan
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