For the front doors, use a 6.5" component set(sepaarate mid/tweeter) and the rear deck use a 6.5" two way. These will be more or less a drop in solution.
Try to use the Nissan speaker adapters plugs so you don't need to cut wires and mess up the electric system, you can get those from eBay or amazon.A 2008 Nissan Altima has 6 speakers, 2 in the dash, 2 in the door, and 2 in the rear deck.
4 motor mounts
how many motor mounts does a 2005 nissan altima have
The 2008 Nissan Altima has 16 valves.
The 2002 Nissan Altima has 16 valves.
The 2001 Nissan Altima has 16 valves.
The 2009 Nissan Altima has 16 valves.
The 2014 Nissan Altima has 16 valves.
The 2005 Nissan Altima has 16 valves.
The 2004 Nissan Altima has 16 valves.
The 2011 Nissan Altima has 16 valves.
The 2010 Nissan Altima has 16 valves.