I remember you mention that the hub is different. However, there is some people in the forum say that the 400 and 500 are interchangable and the 500 and the 600sl are also interchangable. Thus, the 400 and the 600SL is interchangable. If you can put the 400 on the 190, you should be able to put the 600sl on the 190 thus the 300E. What do you think?