RB2-6474-000CNPad - 500-sheet separation pad - Small rectangular rubber pad on front of cassette arm - Not the one on metal lifting plate
RC1-0939-000CNPad - Separation pad assembly for the Tray 1 position and fits in a holder that sits just below the Tray 1 paper pickup roller.
RM1-1298-000CNPad - Separation pad assembly - Includes the pad and spring located on the arm in the holder frame - Mounts toward the front of the tray 2