Smaller belt is the balance shaft belt. When you change the tbelt, it is highly recommended to change the idler pulley, tbelt tensioner, hydrolic tensioner, and balance shaft tensioner. Parts for a tbelt job including the water pump is usually around $200-300.
If you arent going to order parts from a dealer, I would order from:
http://www.store.partsdinosaur.com/index.html
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