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It came with a new hat and then this circular metal "coin". It was SUPPOSSED to come with instructions but none included and no response back yet from them. What is with the coin?
I put one of those on my '85, the coin is just a washer for the screw to press onto as you screw it down, it sits on top of the diaphram assembly, i ended up leaving mine off because the bolt was too long and hit the plenum, it works fine without it.
the reason i used a longer one was because i wanted to use a lock nut on the bolt, just for info the afpr held pressure longer with the lock nut in place.