For sale is one NOS (new old stock) Original OEM GM, Chevrolet Impala Belair Caprice and Biscayne Heater Blower Switch, GM part # 3967938 (replaces part number 3937155).  The parts book shows this is is correct for 1069 and 1970 full size cars, including impala.  Comes in the original GM box.  Pictures show the actual item you will receive.