I am redoing the dash in my '70 Challenger with AM/8-Track. The car has the stereo wiring harness but no fader or crossover. I purchased the crossover box, but I can't find where it mounts in the car. I know it goes behind the glove box, but I can't find any existing screw holes in the dash frame or firewall area on the car where its supposed to go.

Where is the correct location for the box? Is the crossover box only for rear speaker cars, or for all AM/8-track cars?

The car is a 3-speaker dash car and still has the original speakers in place. There are rear speakers, but they are aftermarket so I can't confirm they are original. No broadcast sheet to confirm rear speaker or not, fender tag is R22, AM/8-Track.

Thanks, Joe