Heavy Duty Blower Motor EARLY serial numberOEM part numbers 1987399C2 Item Information Replaces Bushing Style Motor with New HD Bearing Style Motor With 48" Wire Leads Wire Identification: Orange = High Speed, Yellow = Medium Speed, Red = Low Speed, Black = Ground Additional Information Early Series 4 Wire Cab Serial Number 107806 and Below, 3 8" Double Shaft 4 Wire Ball Bearing Motor Specifications TYPE Double Shaft, 3 Speed SHAFT SIZE 3 8" SHAFT LENGTH 4 1 4" MOTOR DIAMETER 3 1 2" MOTOR