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Looks good mate, solid build quality as well i'm led to believe!
An interesting read for you;
http://www.bridgetogantry.com/2/index.php/home/news/274-two-years-and-2800-laps-later
You can't swap them due to the handles to access the rear.
There are only four bolts holding them in, i'd take the whole seat out and get a good look at the sliding rails.