HP LaserJet 4100 rear cover

from comparing your pic with the partsurfer diagram, I'd call it:

Hi folks, I just acquired an old HP 4100N laser printer that is missing the rear dust cover. A drawing of the missing cover from the user manual is here: http://home.earthlink.net/~jdbryan/dropbox/hp4100-cover.png This cover attaches at the bottom of the rear of the machine and covers the back end of paper tray #2 and the fuser assembly. It's present if the printer does not have the duplexing attachment. Could someone who has one of these printers please let me know the part number that's molded into the inside of the cover, so that I may locate a replacement? The cover number probably will be of the form "RBn-nnnn". Beware that there will also be part numbers present for the plastic resin used in making the cover (e.g., "Cycoloy C6600-GY8070" or "HP Material PN 4093-2825"), at least based on the other covers on the machine. Thanks! -- Dave