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In 06, there was only one MP3 player, it was well marked and only held on CD. As for installing the Monsoon, sure, it can be done. But if the wiring harness is different (i.e., does not contain the Monsoon wiring), it will cost a small fortune.
You would be better just to switch heads if you want to keep the factory look, and then have an aftermarket install an amp and better speakers.

You might be able to find the MP3 radio online, possible on eBay. For those who have switched out their radios for Pioneers, etc., some might sell the unit. I kept mine to bring the vehicle back to stock when I sell it, and I'll put the Pioneer in the new vehicle.

If you do purchase a new unit, you will have to have the dealer program it to the VIN, since when you connect it, it will immediately lock.