DOP73-050 MTD Snowthrower Complete Auger Assembly No. 984-04027A. This snowblower auger assembly fits 21" single stage snow thrower 31**1** and 31**2** models built from 1990 to 2005. Replaces MTD part numbers 984-04027A, 984-5485, 784-5485, 706-1568-00-11, 684-0427A, and 684-04025A.