Have a new to me gen 1 2003 Prius. The battery cooling vents are behind the rear seats on the ledge in front of the speakers, under the back window. The little vent covers are terribly dry rotted. I pulled them out but can’t figure out how to find new covers for them! They sell a similarly sized cover for later Prius vents but it doesn’t quite fit in the hole.
Welcome! The part number is 64337-47012-B0 (I guess it's two of them flipped 180 degrees). Do a web search for that and you should find listings from a few sellers.
