Any speaker will work, but 5V boards need 16ohm and 3V and PS-3 use 4 ohm. Normally 50mm dia and 17mm height. But depending on engine smaller dia also and you need to make sure of height and magnet size as some speakers come through a small dia hole in the frame. So you need to take the measurements, of Dia and Height and make sure it will fit for the specific engine. G
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