ABU Ambassadeur 2500C, 1500C High Speed Gear System 6.3:1 by Simon Shimomura
Simon Shimomura. Compatible with models: 1500C, 1500CDL, 2500C, 2500CDL, 2500CI, 2500CIAR but not 2600C, or 2501C. Use my “Smooth Operation Clutch Kit” for the best fit to your reel. Simon says, this is the conclusion.