Many thanks for taking the time for this, Silk! Much appreciated. There is a big cast plate over the front of the engine, and the tensioner comes with a spring unfortunately.
In this market, the 12-valve SOHC was used until the redesign in 2001, after which the 24-valve SOHC was used. Even for 2009, you have two engine choices: the 24-valve SOHC 6G72 (3.0) as standard, or the 24-valve SOHC 6G75 (3.8) on higher end models.