Interesting information, Nippon. Thanks! But my question was regarding the Automatic front caliper vs. the K3-6 and how they differed. I'm trying to determine swapability between mid-K's, Automatics, and late 550's. And no, I haven't checked the parts books yet on these particular parts.
I have determined that the F2 rear caliper is the same as the F2 right front caliper, and that the DOHC dual puck calipers with mounts will fit the K7-8 forks, but I'm still figuring out some of the other usable combinations. But thanks again. RR