For any car including Kia Sorento timing belt is the most important part for gas grid. When servicing Sorento 3.5 buy original Kia timing belt – it’s not so expensive. First thing to look at is 259 number of teeth and also important width of 32 mm. In 2003 and motors having code G6CU the company used usual belts. Nevertheless, you need optimal size for 3.5 motors installed in Sorento.
For 3.5 motor service in Kia Sorento you might buy lots of analog accessories. Check if your parts for service of 2006 Kia Sorento are of good quality. But you surely need for 6G72 motor number only 32 mm wide belt.