Aggravating, to say the least! My dealer, 20 miles from my house,
sent me home with the smaller hydraulic filter. Lucky he was still open when I returned. The second time he sent me home with the larger one, PN ESL15900, and it fit fine. It shows the number 551715 on the outside.
Lesson learned: always take the old filter with you when you go to get a new one!
Good luck!
Tex