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to quickly summarize:C9500-16X ("low performance" for whatever reason) => C9500-4PT-KIT=C9500-32C, C9500-32QC, C9500-48Y4C, C9500-24Y4C => C9500-4PTH-KIT=I think the c9500-16x is less deep than the others, so it needs longer rail extensions.
