The brackets are to narrow for the sled.

BTW, any idea what the screw hole size is that's located on the back of the sled?

Here's a pic:

http://www2.freepichosting.com/Images/37446/6.jpg

The tape deck has a support screw on the back that slides in a hole in the back of the dash. So, I want to use the same method to support the back of the sled.