The Differences Between the 17896 and 19030 are That the Ignition Terminal for the 17896 is at 3:00 (Pointing Forwards) When Viewing the Unit From the Rear, and the Battery Stud is at 4:00 (Pointing Outwards to the Right), While the 19030 Has the Ignition Terminal at 7:00 (Pointing to the Rear), and the Battery Stud at 4:00 (Pointing to the Rear). The DE Frame and Pinion May Be the Same Between the Two Units. Also, the 19030 Uses a Threaded Extension on the Rear of the Thru Bolt at 2:00 (From Rear) While the 17896 Does Not.