I am not sure if this will work. The springs in XT V-brakes are pressed-fitted into the brake-arms, as far as I remember. I was trying to use another Avid-version, but there is the same issue.
I am not sure if was an XT spare ... it seems me more it was XTR . At this time it sound me strange but it worked : my friend was happy to follow using the brakes on another frame . Look on the Shimano catalogue for XTR ... maybe will help