What is the differens betwen the Progressive suspension 412 and the 440´s?

Does both fit our bikes?

I am also wondering if the 412´s will fit with the crome cover that they have as an option, anybody tried that?

http://www.progressivesuspension.com/412.html


Gooseman Bonneville America 904 Black/Silver Triumph Tiger 1050 Black Ducati Multistrada 1200s