I need to replace my mother's Pentair-branded 7-177450-03 motor. 1HP/1.65 SF, Y56Y mount. I am in California, so I'd need a dual or variable speed motor. Is the ECM16SQU the correct replacement here? I didn't get a look at the pump, but I'm betting it's a WhisperFlo - would it be something else? I can go back and look if needed.