So this is my first time rebuilding KH discs. They are on my 70 Dart. There are the remains of a foam gasket between the spindle and the dust shield. It looks to be a triangular gasket that has holes for the 3 bolts. Like I said, these were really degraded so it's hard to tell what they looked like originally. DMT sells foam gaskets that they say fit drum and disc systems and they are a round gasket with a round hole in the middle. It is hard to tell if you could just use them and push the bolts through once the spindle locates the gasket or whether I need something specific that looks more like what I removed. Any of you brake gurus have some info for me?
