2004 Chevrolet Silverado Emergency brake

Visit any salvage yard. They have "Hollander Guides" that have that information. Those list every part on your truck with a code number. You look that number up in the back of the book and it will list each year and model that part is used on. If you want to take the time, you can also use a site like Rock Auto's to look up the part numbers for various years and models. If the numbers are the same, they use the same part

Be aware that sometimes there are tiny changes to a part that warrant a different manufacturer's part number, so while the interchange guides will tell you they're not the same part, they might in fact interchange with slight modifications. For example, you might have to drill a mounting hole for one bolt that was moved a little for one body style, or the parking brake light switch might be different and have a differently-shaped terminal.