Response to Hello Michael.  The Century 2.0 HP Square Flange 56Y Dual Speed Full Rate Motor - B2984 is a compatible, CA Title 20 compliant, replacement motor for the A. O. Smith Motor model 7-177453-03.  The V-Green 2.7 HP Square Flange 48Y Variable Speed Motor - ECM27SQU is a compatible, CA Title 20 compliant variable speed motor option.  The Tune Up Kit Pentair/Purex Whisperflo - GOKIT32 contains the seals and gaskets necessary to complete the new motor installation. 

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