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Settle down now. I just walked outside and measured it. 23" at the bottom on the side sections and 15.5" in the middle. That's from plastic edge to plastic edge. Keep in mind that 23" tapers inwards on the outsides.
I have a '98 OBS and my rear slider is...... 21" at the bottoms on the side sections. 16" at the tops, and 15" in the middle, top and bottom. That's from plastic edge to plastic edge. I like red, white, or blue..