Can confirm that those are indeed some brake pad spacers. Keep them in the spare parts drawer.

For a new brake cover though, we have those in stock but you would need to reach out to your local Trek dealer to get it ordered. These do vary by frame size so we have a few different part numbers. I know not all dealers are open these days, so if you are having trouble getting it, just let me know.

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Mitchell Mathews | Community Manager | Trek Bikes | @mitchmathewz