I picked a pair up probably 15 years ago in a junkyard. They are special bolts. The head markings are RBW with 3 concentric circles. The head has a built in washer that slopes down off the hex head. There are also marks of each of the 6 hex head flat spots that go toward the edge of the washer. And it has teeth on the bottom side to grip into the coil bracket. The threaded portion is 0.5" long. Does this make sense? This is for a 68. Anyone else have these on their original 68?
Martin