On Thursday, April 14, 2011 at 23:33, I wrote:
  My only concern is that the description shown is
"Duplexer cover -
 Covers the duplexer on the back of the printer" ...but this printer has
 no duplexer (it's an option).  The cover I need actually covers the
 end of the paper tray.  
Aha!  I see from the "Advanced" view on the PartSurfer page that the part
description is different; there, it's "Cover, tray 2," and that is indeed
what it covers.
Thanks again, Steve.
                                      -- Dave