The CS1W-AT033: This is a bulk-packaged adapter, not a standalone module so it doesn't consume rack slots. It mounts in the same footprint as other CS1W AT-series adapters.
Sourcing & Fit
As an active accessory for the CS1 series, this adapter is specified into BOM lines for new builds or as a spare. It is sourced to order from established supply chains; no special broker channel required.