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Yup. Platinum. Lots of it, too.
catco.com has them for about 100 bucks, which is usually cheaper than the mechanic will sell it to you for.
That said, the high pitched sound could be an over-tightened belt that's pulling on the alternator pulley too hard. It may be that you don't have to replace the tensioner pulley - you might just have to re-tighten it to specs. It's not unusual for a mechanic to claim that a part that only needs adjustment actually needs to be replaced, because they can make more money that way. I'd get a second opinion.
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