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I was just working on installing a speaker in my restoration. I started out trying to install the nut style bracket with not much success. I was trying to get it under the ac controls but it looks like it would only work to install it offset by the gas pedal.
I decided to check my stock and found another bracket speaker setup with a different shape and the nuts omitted. I tried it and it fits perfect under the ac but it needs to be mounted on the outer surface of the dash