unfortunately for you... 2005 is the last year of the din and three-quarter opening. In 2006 on up they switched to the doubledin with the bump out on each side. That one will easily accept a double-din deck but you must purchase a new dash bezel from the dealership, it has to be the navigation bezel should be priced around $175.
You can get a double din into your truck (I have done it if I can find the pictures I will post them) but it takes major modification of the factory dash bezel and sub-dash area, which is far more indepth of an install than what the average Best Buy would be able to handle only because it involves using certain beautification methods like fiberglass to make it look good!!
Hope this helps!