That is the kit number to order it. You didn't think you could get a paid option for free by asking on a Xerox owned and operated forum did you?
5755 has 3 models
5755C was just a copier. So no kit exists
5755 copier /printer 497K05760 = MONO SCANNING KIT
5755A came standard with Color scanning. So no kit exists
I contacted Xerox and got them to escalate it to their 3rd level engineers who provided me with the detailed spefication. I then converted it to the chart you see here. I also work for Xerox, in another division, which probably helped in being able to get what I needed. I believe they plan to put this in future manuals.
That's the answer. I read the manual top to bottom too, as well as searched the Xerox support pages, and could not find it. This information needs to be in the user manual. Thanks so much for the chart! Where did you find it?