So for comparison, here are the photos of the kit I found on the web. The following one was from Di Bartoli, screen is small and disk is essentially flat, but it does have an edge for the screen to locate into.
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This one was from Seattle Coffee Gear, the kit has a replacement o-ring, and the outer edge is almost identical to the Gaggia, creating a volume behind the screen. The rest of the face is flat. Also note, how the center screw hole is not chamfered.
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