The internal speakers are specially designed to work with this model—they have a unique shape, unique cables, and unique connectors on the main logic board. I don't know of any third party internal speakers that would be compatible with this device. If your speakers sound blown or damaged, you could replace them with good condition speakers, but if you want longer-lasting better quality speakers, I would recommend using an external Bluetooth speaker. Good luck!
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Edit: Here's a picture of the 16-inch 2019 MBP speaker with dimensions.
The internal speakers are specially designed to work with this model—they have a unique shape, unique cables, and unique connectors on the main logic board. I don't know of any third party internal speakers that would be compatible with this device. If your speakers sound blown or damaged, you could replace them with good condition speakers, but if you want longer-lasting better quality speakers, I would recommend using an external Bluetooth speaker. Good luck!