I'm replacing a blower wheel number B1368047. The only one I can find is B1368047A on which the set screw is on the convex face of the center plate. On the B1368047, the set screw is on the concave face of the plate. The B1368047A will not go as far onto the motor shaft, so the wheel and motor vibrate causing a loud noise throughout the house. The vibration will also damage the motor. I've ordered the correct number, B1368047 from others, but continue to received the B1368047A. My furnace is Model GMNT100-4B, so it's not 10 years old, and has only been installed for 8 years. The serial number is 0405706501. Does anyone know where I can find the right part?

Where are you ordering the parts from? You need to have the parts ordered from a Goodman dealer, one with experience.