Response to 20+ year old Hayward pumps use: SP-1621-C impeller (old style with threaded phenolic hub rather than brass insert) SP-1616-B diffuser Are the SPX versions of these parts direct replacements for old SP part numbers? Also needed: Full set of seals, Q1 replacement motor. We have three pumps with 2HP 50Hz motors. Planning to substitute 2.5HP 60Hz version with same dimensions if 50Hz not available. thank you and best regards, Robert Schlemmer Houston, TX

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