Rad Power Bikes has verified that it's a 750W Bafang hub motor. My gears on the clutch are larger than what I find for a 500W-750W gear/clutch set. I think I've found a gear clutch set that is closer in size (but not quite) to my set, and it's for a 750W-1000W motor.

This task of finding a gear clutch set has consumed hours and hours of my time. Since my gears are OK, I've since discovered that the gear bearings can be changed (I found one bad bearing on my gear clutch set).

So I am changing all 3 bearings to high quality bearings which I believe will correct the noise. I will continue to casually search for a gear set that matches my size (gear OD 1.93" (49mm). Gear spacing (across two gears 4.26" (108mm). Gear spindle/axle spacing 3.0" (76mm).

If anyone stumbles upon my sizes, please let me know. THANKS!