It is the buyers responsibility to examine all items to determine if an item is safe for use - the buyer accepts all responsibility for use of items purchased
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You get what the photo shows - 2 of the rear plates for mounting a Campy (or other brand perhaps) rear derailleur to a dropout without a derailleur hanger. We asume your derailleur has the hanger in place that goes on the front of the dropout. Its common to find used derailleurs with this back part missing, so it could be handy.