Blower Upgrade Kit changes 3/4" blower components to 1" blower components. Comes with a 19" x 18" x 1" blower wheel, 14" x 1" blower pulley, 1" cooler shaft, and (2x) 1" high-rise pillow bearings...
Blower Upgrade Kit changes 1" blower components to 1-3/16" blower components. Comes with 21" x 20" x 1-3/16" blower wheel, 14" x 1-3/16" blower pulley, 1-3/16" x 26-5/8 long cooler shaft, (2x)...