It could also be an older engine swapped in to your car after someone overheated and killed the original one when the headgaskets blew.
I got a Gates timing belt kit off ebay for $180 shipped for a newer engine. It had koyo bearings in all the idlers and a new water pump and tensioner.
It's good you're getting the kit, a lot of people replace just the belt expecting the idler bearings to make it to 210k miles. Often, they don't. And when the idlers go they take the belt with them. The 04 2.5l I put the timing belt kit on had the belt done at a subaru dealership at 110k and I got in there at 180k. A couple of the idlers had significant play in them and they all sounded dry when spun. Replacing them is cheap insurance, and really should be factory recommended.