The Ariel Bathtub you are looking at model AM128 is actually manufactured by EAGO a European company. These tubs are truly the Mercedes of bathroom products but are reasonably priced because EAGO is not a known brand name in North America yet.
The bathtub you are looking at is ETL certified to UL and CSA standards for US and Canada. Depending on who you buy it from it may have more or less options available on it.
If you want one with all options available I would suggest purchasing from http://perfectbath.com as they not only supply product with all options available but they also provide free technical support if you need it later on and have spare parts on hand in there warehouse so you wont be left hanging if you ever need a part.