Wanted: Diaphragm

Just wondering if anyone has a Diaphragm measuring 12.5mm or 4 7/8" in diameter and .5mm or 3/16" thick… Or if you know of a place where I can buy one at this size!

Any help would be greatly appriciated!

Thank you :slight_smile:

Is this diaphragm for a kahalenberg horn…??

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