GMSERIES 3, they are a bit expensive around $600 but they are a direct replacement and will include navigation as well. They are mostly easy to install, I've done it myself in multiple vehicles (I work for a Chevy dealership in the fleet department doing sales and the equipment upfitting) from police to fire and they have all loved them.Part number and price? Did you do the install yourself? I was looking at pioneer systems, but there are so many different models.