need part

I am an electronic repair tech. I have 2 Nutone IK-15. Both have a bad 16 ohm speaker in the outside door speaker of both units. I believe the model number for the outside door unit is model# IS68. I would like to purchase just the speaker itself, not the entire door outside unit. I am also interested in just the outside doorbell button switch. The speaker is a 3" speaker with a square mounting. Can you help me with this? Please Reply Thank you, Dennis

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