Blew86442 said:
Ive always used 6x9s for better sound quality then 4x10's. Ive never used the adapter brackets either. Trim a little and create new mounting holes for the hardware. Very easy to do. Ive done it on 5 different g bodys
That's the way I have always done it, I just trim a notch out and drill new holes and mount them from underneath, you can't see them and because you are not using an adapter there is no interferance with the trunk bars.
You do have to remove the back seat while trimming the notch to do it the right way.
On my Monte I had to move the 6 x 9 speakers inboard and also cut out the oval holes because my rear roll bars go into the trunk where the speakers used to be.