New Standard neutral safety switch.  This is also a multi-function switch, which lets the vehicle know if it's in Park/Nuetral, Drive or Reverse, so it is also the reverse light switch.  These switches require adjustment when replacing one.  The adjustment is done by loosening the 2 screws and and checking the shifter position through each gear to ensure the switch is properly located on the column then tightening the screws.  If the switch is not adjusted properly, the vehicle will not start.  This is a 7-pin switch (79 and newer use a 5-pin switch).  Fits the following:

70-73 Camaro (all models w/ Automatic transmission)
70-73 Firebird/Trans Am (all models w/ Automatic transmission)

NOTE : This switch looks similar to the 74-78 switch, except the 70-73 does not have the connector block out tab near the park/nuetral 2-pin portion of the switch.   This will not work in 74-81 models.