What cd player can you fit in a 05 wrx? and how, with what hardware do i need?

 

I put in the sony explode the newest one the stores got, no hardware required, If you dont have connector for new player than u should buy it in any video audio store, it is about 20$ and u all set...

 

You can install any head unit that is designed for an ISO-DIN setup. Most are but you should verify that any particular unit you are looking at does.
You will reuse the existing brackets that attach the stock HU to the console so no extra mounting hardware is required. However if you are replacing the dual-DIN unit with a single-DIN you'll need a blank plate or pocket to fill the open space.
You'll also need a harness adapter to connect the new HU to your car without the need for cutting and splicing.
If you purchase from Crutchfield, and perhaps certain other vendors, they will include the pocket and adapter along with the HU.