Ok, from what I understand, 1985 and older 14bff are the one's to get for a disc brack swap. 1987 or so the 14bff went to some external way to mount the drum onto the spindle or hub ?(DIY.com kit will not fit these). So basically one would want to get a 1985 or older 14ff if contemplating a disc swap. I noticed on a 1988 K30 14ff has some ribbing on the back of the center section. My 1985 doesn't.Is there any way to externally tell if a 14bff is the new style vs the old?