Response to Hello Arthur.  The Century Motors Magnetek 1.5 HP Up Rate Motor model B2854 is a compatible replacement for the Century Centurion Motor part number 168453-24.   B2854   It is recommended that the motor shaft seal, seal plate gasket, and diffuser o-ring be replaced concurrent with the new motor.  A GOKIT will contain these necessary parts.  The correct GOKIT is dependent upon the Challenger Pump Series, CHII-N1, CFII-N1.  Attached please find the Challenge exploded parts diagram.  The GOKIT selections are the first items listed.  Pentair Challenger  Please match your pump model to the appropriate selection.  

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