We'll the 16 rad costs less money here sorry, only 54€ less..
All parts purchased fm an official dealer come with the official 2years warranty..
As for the Sargent seat can recommend two options if someone needs to travel with pillion and a big bag. First the 55lit capacity by BMW Motorrad, this although its a huge bag fits and seats perfectly in the tail and can acomodate a lot. Then comes the t_bag a US product (Excellent brand) expentable fm 24 to 34lit that is secured in the pillion supporter (if you have it) and sets in the tail, the late is excellent and doesn't create the light steering effect so obvious when the huge oem bag is fully loaded.