Here is an idea for you, I used a Gamber-Johnson mount that bolted to the seat mounts and would allow you to mount a radio over the transmission hump. Here is a link to how it was done and some pictures along with the URL to the Gamber-Johnson website with specific info on the mount.
I have also mounted a remote head to the area under where the cup holders would be. You have to remove the cupholders and you would be able to mount your bracket under it. You will probably need some spacers between the area of your bracket and where the screws would be mounted.
If you need further details, send me a PM.
Here is the link to my post on the install:
Vehicle Install Ver. 1.0