Timing Belt

It would be a good idea to change the water pump, idler wheels and the thermostat. Change the serpentine belt too. The dealer will look up the part numbers but an independent shop will save you a lot of money. Gates sells a full kit for the timing belt change with all the parts you need.

FOR is absolutely correct...by the way get all genuine Subaru parts...while it might seem extravagant you will be saving money in the long run. One more thing I would recommend, change your super-coolant in the radiator...yes Subaru has a special coolant for this and it will last you another 100,000 miles.....again, focus on the big picture here. You think this is expensive, you should see the maintenance on my Sprinter....makes the Subaru look like an economy car. I'm not kidding.