Hello I have an old 76 nova that has the 1999 Pioneer DEH P2000 head unit that I am wanting to upgrade to a newer unit. I dont have the keys or any idea on how this is suppose to be removed. I have looked through the product manual, searched online, and on youtube and haven't found anything that would help. If anyone has any idea how this this is suppose to be removed and exactly what keys are used for this, please let me know!!!