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I have 5203RS bearings in pulleys used in serpentine belt system on Z06-LS6 Corvette engine

I have 5203RS bearings in pulleys used in serpentine belt system on Z06-LS6 Corvette engine.They are junk and have had to replace 8 in 20k miles!!What quality are these and what can I replace them with that is best quality and last??What is the Timke

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