1Fitment: Voltage regulator rectifier is replacement for John Deere Lawn Mower Tractor, replacement for Onan P, B Engine 16?20HP. 2Oem Number: Voltage regulator replace part number for Onan is 191 1748, 191 2106, 191 2208, 191 2227, for John Deere is 318 420. 3Feature: In automobile alternators and central power station generator plants, voltage regulators control the output of the plant. 4Advantages: This voltage regulator is used to regulate Dc voltages and it is safe to use. Exquisite workmanship, high accuracy. 5Performance: Abs and metal material, excellent heat dissipation performance, precise and firm, high strength, not easy to break, sturdy and durable. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin