I'm having a hard time finding the correct motor to replace the one that goes in the blower for my heat pump. It's a 3/4HP GE, 208-230V model with a number 5KCP39NG T739S, and is direct drive. Are there other brands that might work? Or is there a place to find the exact match? I see other ones that are similar in number (5KCP39PG or SG, but not NG) - what's the difference?