Tensioner Pulley replacement

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My tensioner pulley (non AC serp) is squealing like a teenage girl. I've looked online and they range from about £30 on ebay for a Rangie 4.6 version up to £50 from some TVR specialists. Is there any difference?

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A squirt of GT85 is doing the trick, temporarily.....

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Sounds like a winning idea... where do I get one from?

[ButtonIt]

Sorry, I meant where do I get the new mount, not a new bearing.