The 2002-2008 Dodge Ram can be broken down into two generations. The 2002-2005 seats are rounded, the 2006-2008 seats are more square. In 2006 Dodge introduced the Mega Cab. The Mega cab uses a different rear seat than any other cab size. In 2006 Dodge also introduced the first real center console for the Ram.
These will fit 2002-2008 Ram 1500, and 2003-2009 Ram 2500 & 3500.
You can easily use the 2009-2015 Seats in your 2002-2008 Ram. Read more about it here.