Lexmark
40X8177
is compatible in the following Printer Models:
Lexmark Paper Handling
MX82x, XM73x 2100-Sheet Tray Option (0464-HC7)
2100-Sheet Tray Option (0464-HCI)
MS81x, MX71x 2100-Sheet Tray (9055-026)
MX81x 2100-Sheet Tray (9055-027)