
The speaker mounting holes line up with the bracket mounting holes in only one place. This shows how the rest sit with that one hole lined up. In this first picture, you can see how the hole on the speaker doesn't line up with the bracket hole. The other two speaker mounting holes out of picture don't even sit on top of the bracket. They're hanging above open space.

This is the PITA bracket. There isn't really any space to drill new mounting holes in it.
I'm going to take the MTXs back because they measure across the same as the Kenwoods and there is no sense in paying $100 for them since I already have some the same size that were free. I am almost convinced GM did this on purpose, although I don't know why. I am going to Tweeter today to see what they say.