Here's the K-frame in question that I did the details on a long time ago over on the A12 Registry. Note that the bottom is already shaped to allow the '70 sway bar to run through it and not in front like the earlier K-frames. Also note that the bottom '70 style has the holes for the bolt on sway bar mounts only through the bottom half and not through the top. It has the early '69 front sway bar mount holes punched through. As pointed out in the earlier discussion the change over to the K-frame to accept the '70+ through the K-frame sway bar just happened to coincide with the A12 production although a few of the very early A12's did have the '68, early '69 K-frames. The 6-26 SPD '69 Road Runner was a car I owned that had the later '70 sway bar type K-frame and the illustration K-frame is also one I still have. '68/early '69 K-frame is the third/bottom image

Mike