Hoping for some help with installing a new stereo head unit. To be specific -- I've got it installed, but not in the way I was hoping. One of the reasons I bought a Kenwood DPX500BT stereo is that it ships with a matching trim ring specifically cut to fit Toyota dashboards. Here's a photo of the head unit with trim ring (it snaps right on):

Here it is installed in an '07 Matrix (photo found online):

Crutchfield shipped the unit to me with an American International GMK-422 plastic mounting bracket kit:

Right now I have the stereo installed using the GMK-422 trim ring because the fronts of the GMK-422 bracket mounts prevent the Toyota-specific trim ring from being attached/seated properly to the stereo unit.
I suppose I could perform some surgery on the GMK-422 (i.e. hack the problem bits off) and only use two or three bolts, but I'm wondering if there's another solution -- maybe a different dash mount kit? -- that would let me use the Toyota trim ring right out of the box. Of course I'd be happy to just use the Vibe's factory (metal) brackets, but there doesn't seem to be any way to align them with the new head unit's mounting holes.
If anyone happens to have this stereo (or the Kenwood DPX300U -- same stereo without BT) installed, can you let me know if you were able to use the Toyota trim ring (and how)?
Thanks!