Heavy-duty, weatherproof with a five-roller clutch means that you can use this starter drive Bendix gear assembly for year with trouble-free service. Fits 1965-1988 Harley FL Big Twin & 1967-1980 Sportster 900cc & 1000cc Dimensions: 12mm ID x 42.5mm OD x 41mm L Replaces HD# 31443-65A Made in Brazil by Zen Manufacturing