[eckemoff]

You don't need the brackets or an aftermarket install. They only work with a OME unit.

A metra kit comes with 2 plastic brackets that are used and the original metal ones are discarded.

 

[eckemoff]

It may be different for 08 models, but my 09 (bought late 2009, so it is basically an 2010) did not and could not use the original metal brackets for a double din HU.