Response to Hi Howard, The mounting plate that the motor bolts to is square but the motor flange is considered round or C-Faced. The model number you provided SP2610X15 cross references to a UST1152 as the replacement motor but the motor number C48J2N131B3 is replacement by the UST1072 motor. So if the motor was downsized then you will need the UST1072 motor along with the Hayward Super Pump Tune Up Kit - GOKIT3 or GOKIT3SALT.

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