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#16 is a pure carnauba paste wax from Meguiars that is no longer sold in the US due to EPA regulations. It should only be used on top of a properly prepared finish as it has no cleaning, polishing, or filling properties.
glc hit the nail on the head about #16. E-Shine in Canada still has some left from their "new" order and it's on sale for ~$15 plus shipping right now.