Yep, standard or in the Exclusive range , however if all you are wantiing is a taller seat buy secondhand (damaged cover preferable and cheaper ) and if it suits get it recovered to match the rear.
If you look on the BMW Motorrad website and download the brochures on the gsa and gs it give sull details of all optional seats , their heights and cover patterns
Other option if you want to go higher is try to borrow a gsa seat first and try it because imho the standard one is a utter pain in the a**e