I am currently working on a 75 Valiant and wanted to upgrade the stereo a little. The car was already cut for a single din head unit and I had a pair of 5.25" speakers sitting in the garage. I laid under the dash and did a quick mock up.
I decided to use two of the speaker mounts to hit the original mounting studs. I just had to space these two at 11.375". It appeared that I needed to rotate the speakers slightly for clearance. I just eye balled this and didn't try to put a value to the angle of rotation.
After mocking it up on the table, I took a couple pieces of small angle and cut to fit between the other mounts. I then drilled these and bolted the two speakers together to create a single unit.
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The unit mounted up fine under the dash and cleared the HVAC controls and mounts. I have put everything back together at this point. It appears that I rotated the speakers too much and now they sit a little further towards the rear of the car. The speaker frame ended up covering one of the defroster vent mounting holes on each side. I ended up just shaving that stud off the vent. The vents in this car weren't the best so I didn't feel bad about it. I don't have the head unit wired in yet to see how it sounds but it has to be better than the empty space that was there before.
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Also I just want to state that I'm not trying to take anything away from those that make and sell the nice speaker mounts. This was a just trying to use what I had and cob something together in a couple hours in the garage type of project.
