Parts list are included in the service manuals and those are part of the Authorized Service Provider Training kit.
The tray you referenced is part of the bookmaker accessory which could be used on multiple models but we need additional details to know exactly which finishing accessory you have, so someone can try to provide an answer to your questions.
Can you provide the serial number? It is 9 characters and is located inside the finisher door on the top frame?
You may also consider contacting our specific product support experts at the following link to get the part number: Fast Track to the Expert
Mitch Swetsky Xerox Customer Tools & Social Media Moderator
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What is the part number of this booklet output tray? I have a Color 550. I assume this tray is the same on the 550, 560 and 570. Is it also interchangeable with the 240, 250, 242, 252 and 260 machines? Is there a way to find out the complete list of machines that use this same booklet output tray?