Seat Leon (Mk2) Roof Bars - Altera Signo ?

Altera Roof Bars for SEAT Leon Mk2 (2005 to 2012) Good condition, used for 3 trouble free years to transport bikes and kayaks. Selling due to change of car. See link below for maunfacturers details http://www.atera.co.uk/roofbars-roofracks.php