2000 Polaris Indy 500 / 600 snowmobile service manual, Page 166Get this manual
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CLUTCHES Drive Clutch Weight IdentificationActual Size
10-58 Bushed Gram Weight: 58 PN 1321588
10-56 Bushed Gram Weight: 56 PN 1321684
10A Bushed Gram Weight: 55 PN 132