7443 Bulb you need - https://amzn.to/3XdoN7Q
Here is a quick and simple video on how to replace your burnt out brake light on your Honda Odyssey. This specific van is a 2012 EX. Yours might different slightly but the process is very similar for vans ranging from 2011 to 2017. You will need a Philips screwdriver or a socket to remove the two screws just inside the deck lid. Once those are removed, you can tug the light housing out as I've shown. Twist the bottom bulb for the brake light. Replace it with your new 7443 bulb and click it back into place. Alight it up back up and give it a firm push back into the correct position. You're all set! I hope you found the video helpful!