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Right, this is an RSR racecar part, not a streeter. You need to know which crank you have -tapered snout 964, or 993 based. My RSR sprint motor circa 1997 used a 964 crank, which used a Harmonic balancer, and that appears to be what you have, adding another issue.
Likely these are NLA from Porsche Motorsport, as most all those parts for that serpentine kit are(tried to buy an idler a couple years ago).
Good luck
GAS Motorsport
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Upland, CA
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