Has anyone tried to fit 2- 4" round speakers in a front dash of a 69 Road Runner using the factory bracket? I bought a 4x10 dual voice coil model from Custom Auto Sound. It fit with some modifying, but I am not happy with the sound quality. I was wondering if a guy used 2 holes from each 4" to mount to the factory bracket and make a brace to hold the inside four holes toghether. This would all have to clear the heater control and top of the stereo.