On the 2005 Patriot (which I'll bet is the same door), the "opening" width is 27-3/4 inches from seal lip to seal lip (the dimension needed if you were wanting to get something big inside), up to the height of 64 inches, then the top tapers in to a width of 21 inches at the very top.
If your looking for a replacement door or a screen door or such, the dimensions would be different.
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