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It should be under the drivers side,there are pics on some posts here on the site that you can see what to look for under there.It will have the factory number on it.Some say its hard to seen it,but it's there.
It's on a white sticker on a computer box way up behind the emergency brake, it's 5 numbers and it works like a charm. I just did the same thing with my 02 and it went off without a hitch