2008-2010 offered 2 seats in the 3rd row (with a tether anchor for the 3P), whereas older models only had one seat in the 3rd row (and had a tether anchor for this seat).
For 2009-2010, there was also an option for captain’s chairs in the 2nd row instead of a bench (making the vehicle a 6-seater instead of a 7-seater).
For 2004, Hummer changed the 2nd row – now there are lower anchors in 2C & 2P (instead of 2D & 2P for 2003). The 4 tether anchors – one for each of the rear seats – remains the same. There continues to only be 1 seat in the 3rd row!
This vehicle has only one seat in the 3rd row!
2003 Hummer H2 owners manual