Any idea what this is

[Choosing a name is hard]

It in the drivers foot well and dropped down when the knee pad was removed

 

[Steven Smith]

Looks like the cruise control vacuum switch.
Fits in a holder above brake pedal to disengaged cruise control when brake pedal pressed.
They often come loose

 

[Steven Smith]

There it is in situ.

The holder it fits in.

 

[Choosing a name is hard]

Thanks that makes a lot of sense now