Revisiting this thread, what does the upper die look like and where can I get one? I don't need the waffle impression as my LCAs don't have that feature.
And what size bolt under the rivet to support the rivet,? I'm guessing grade 8 would be preferred.
Guess your asking about the upper dies used for reproducing the "look" rather than the original dies. The ones people have made vary a lot to the point to when Rare Parts were doing them they had 24 different waffle patterns made up because so many customers insisted that the others were not correct but their pattern was.
These have been posted before but here are a couple of close ups from original assembly line uppers from April 69 for comparison once you start looking at dies and making choices. Sorry don't know anyone currently that is selling the dies. Maybe someone else does


Interesting to me is that the waffle depressions at the edges do not always extend past the edge of the pattern all the way around as if it was made a specific diameter round and they attempted to center it on the rivet and if off slightly they produced the run over. Just an observation on my part