they do come with shims for 1 or 1 /18 but they are defintely not adjustable 180 degrees ( that wouldnt work anyhow as they would adjust into the tube which holds them .... or do i see that wrong ?? ) I would thing that they are adjustable 45 degress which would mean that if you turn the stem around you probably get a total of 75 to 80 .. degrees...

thor
you can always call me order one and if it doesnt work send it back ... no problem