How did you do the measurement? I can check my F/F1 arm also (unmounted). The Cal Fab would need a brake stay mount welded on.
On the pivot tube..? I used a tape measure in MM one of the swingarms {in the K@ frame} doesn't have the collars on it so it was easy, the other i just measured in frame and it was so close to the K2 that i assumed it to be identical, the calfab was easy, took it out the box....
Jerry, for length, measure from the centre of the pivot tube or bolt {same measurement} to the front of the axle slot, for width, just measure the swingarm itself, not the bushes or with the collars or caps or whatever you want to call them, just the width of the actual swingarm pivot tube... Thats what i measured....