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How close to the back of the pulley does the belt ride? Perhaps you can get a bearing spacer from McMaster Carr. Otherwise clearancing the block I guess. Seems like an odd problem though. I can't imagine Subaru would improperly design a bearing seat. Seeing as they've been putting them on every engine ever.
Simply replacing the pulleys will probably stave off the issue for another 50k miles though. Which would likely make it a non issue
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