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You can either go by your local Tesla Service Center or put the information into the service section of the app. By using the app, you'll only have to go to the Service Center once the part arrives.
Did you damage it some how? Mine popped loose several times and was replaced for free... if yours fell off (not accident related) it should be a warranty replacement.
Accidentally scraped garage pillar and scratched it up. I went to the service center and ordered one. About $50. Service writer told me that those are finicky about having the metal fender just the same as the garnish.