@user110973 that piezo looks fine to me! If you have a choice of voltage/impedance I'd choose the lowest voltage or lowest impedance as they'll be the loudest, but otherwise any should work.
@nsg yes, it's not great, however even when the piezo is installed it's not desperately good. Personally I'd say the vibration motor is maybe half as loud as the piezo - so it' not masses!
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