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Hello Trevor
I've had the idlers replaced once by an astute shop who didn't like the way they felt. I did not replace them the last time I changed the belt. I would agree with the water pump replacement. Easy to do at that point. I've yet to replace the tensioner on mine. The car has lived it's life exclusively in the rust belt here in the US. Roads are typically de-thawed in winter time with salt. Summer '02 when I replaced the head gaskets, I depressed the tensioner to remove it from the bolck while tearing down the engine and saw no evidence of corrosion. He's wise to be concerned about it failing, but I don't think it's required.
Best regards,
Todd
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