Prior to 1988, Lester Referred To This Unit as the 16784. Since Then, They Have Changed it to the 16408. We Have Combined the 16784 and the 16408 Into the 16408. This Unit Looks Like the 16401, Except All Three Mounting Ears are Threaded and the Solenoid Ignition Terminal is a Spade Connector, Rather Than a "Screw-On" Type. There is 2 Models Here - PIC No. 120-182A Which Does Not Use an "R" Terminal on the Solenoid, and 120-182 Which Does. In Order to Insure Fit, all 16408's Should Have an "R" Terminal Included, in Case it is Required.