Defrost motor, housing w/heater

There is a part number on one part only is is the electical panel... the number is #2521409

This part number when I found it in an ebay add stated "1965-74 BARRACUDA, VALIANT, DART HEAT BLOWER MOTOR RESISTOR: 72-8 REAR WINDOW DEFOGGER BLOWER MOTOR HEATER RESISTOR"