I know that people are always looking for these plates. In the quest to do one of the things to lighten Quiggs '66 GS I made his plates from, IF I remember correctly, out of 1/2" aluminum. Rememer this was a manual trans. car & from a dead stop would dump the clutch at 3200-4500RPMs. Never did break one, BUT then again the left is chained.
Tom T.