Agree, but while apart you might as well replace them. A week sounds kind of long. Typically yamaha takes 3 to 4 days max, So if you order on Monday you should see parts on Wednesday or Thursday at the latest. Call some of the Yamaha warehouses that are in the magazines. Most likely they have them in stock. To save some money, have them send them in an envelope with a 39c stamp. If they send via UPS your $3 parts are going to cost you $15.00 after shipping.
Chris