Response to Hello JJ, what matches K48M2N110 is A.O. Smith Round Flange 1 1/2 HP Full Rate Motor (C1101, ST1152) which I would recommend replacing the pump seal and orings found in the Tune Up Kit Hayward Super II - GOKIT2.  Upgrading to the 2HP you would have to change the diffuser and impeller depending on whether you have a full or uprated model.  Cface and round flange are the same motor type.

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