As far as I can tell, Apple doesn't sell the daughterboards so you have to go spelunking for salvaged parts with your macbook. I can get all my first-party brand-new replacement parts at https://frame.work/marketplace .

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artisinal an hour ago | parent [-]

It is available as a first party repair part for €16.20 via https://selfservicerepair.eu/

Apple part number is 923-03553

Also available third party via various retailers.

	▲	craftkiller 34 minutes ago \| parent [-]
		Ah I didn't know Apple put their repair parts under a different domain. I stand corrected!