Confirming it goes in the upper left corner of the glove box. I think there's a shot of it in the FSM.

 

You got it!

 

It mounts to the left side where the angle stops. Two screws mount it. I can't remember if it goes just into the cardboard or goes into the metal also. I think its in the cardboard only. (For those who don't know the glove box in a 66 is a piece of folded and stapled cardboard).

 

2nd pic

 

Many if not all of the repro glovebox liners have perforations where the screws and the wires go.