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I have a handful of parts books, AMC and Norton, going back to 1960, and they all show the part 23358 as a thin spacer. Once you get into the Commando parts manuals, this thin spacer is now called a Carburetor heat insulator, with part #NM23358. This doesn't change until Norton started using 32mm carbs, where the new part # is 06-2700 for the combat, 06-3458 for the 850.