Lexmark Sensor 40X3264 is compatible in the following Printer Models:

Lexmark Paper Handling

T64x High Capacity Output Stacker (4061-HCS)
T64x Output Expander (4061-OXP)
T65x High Capacity Output Stacker (4062-HCS)
T65x Output Expander (4062-OXP)
C772, C782 Output Expander (5061-OXP)