Putting a new stereo system in the 80 Z. After spending what felt like days under the dash yesterday trying to mount Kenwood dual speaker ....I gave up. At one point I started taking out entire dash, after removing the bezel and after seeing the rivets I knew I was screwed...You can get to 1 screw on the backside of the duct but not the other....So I was going to remove dash..But I started looking at the speaker and the ac duct and I don't believe..actually pretty sure.. it will not fit anyway !! It got late and I gave up. So I am now looking for an alternative locations. Looked at the kick panel option and someone even installed 6.5 in doors...But that requires modified door. I will replace or modify the dual setup and install 2 single speakers if I can find a decent location.