I think that is going to be a tough one to find. Every thing from the clutch housing back is the same for the 680, 520, 480, 2360, 2460, 2510, 2610. The 520 motor had the 2510 motor, with inprovements so they didn't smoke as much, in the piston. The injection pump and injectors were also changed from the 2510 to a Delphi system. As a past dealer for them, we never got one. Don't think one was ever printed.