I had to make all that from scratch. You might have noticed the motor pulley has fan blades for spokes. The reason for that is the motor fan will run slower below 60 hz, so an auxiliary fan is suggested for cooling. I added a 6" muffin fan on the top cover, but it is hard to push air through a 7" pulley that is only 1/2" away from the fan. By fashioning the spokes in the pulley like a fan blade, it allows the air to be suctioned through instead of being deflected.