Not sure about Sweden, but in USA and UK it seems there are just packages. Can't order individual options. At least that is the way it looks from the lexus websites. This is a big fail in my opinion..
Don't know tbh, they offer it as an option here in Sweden. It's Lexus standard part, but you seem to miss a whole lot of accesories in the us of some reason. Ask your dealer, perhaps he can order them in some way?