2 Genuine FSP 193144 Wheel Kits, 2 wheels, 2 dust covers.
Wheel kits have better metal bushings, originals may be plastic.
8" X 2", 53 Teeth Gear, 1/2" bore, 1-5/8" offset.
Wheels are black, work to replace white, green, yellow wheels, see numbers below.
New dust covers help prevent damage to gears.