Will this topper fit a first gen xtracab?

Its in Milwaukee, a 5 hour drive for me, so I want to be sure. The Craigslist poster insists that it fits reg and access cab equally because the bed dimensions are the same between the two, but thanks to you guys I know that the rooflines are more angled in the xtracab. What do ya'll think?

I also have no idea what the brand is, and he's asking $500. It looks decent enough though.

Thanks!

 

The rear slope on the back of the cab is very different between the Extra cab and single cab. The bed is the same however. The extra cab has a slant to it where the single cab is move vertical. I believe you can put a single cab canopy on an extra cab (there will be a little gap), but not an extra cab canopy on the single because of the forward angle.