Triumph Pre-Unit Twins Front Drive Sprocket 57-0471 Sprocket Size:19T Harris which means it is

Harris which means it is O

Early style jeweled lens and later style round / flat lens

M Part number is 67-5024B

Chrome is absolutely stunning with a mirror finish

I highly recommend replacing it with our new units

Triumph Pre-Unit Twins Front Drive Sprocket 57-0471 Sprocket Size:19T Harris which means it isNew Triumph 650 Pre Unit Twins Front Drive Sprocket. This EMGO sprocket is the same quality as the "English made" types for half of the price. Sprocket accepts a standard 530 or 5 8" X 3 8" chain. Use the drop down menu to select which size sprocket you need. Fits the Triumph 650 Pre Unit twins (Bonneville, T120, 6T, T110, TR6SS, etc) from 1947 1962. Also fits Triumph 500 Pre Unit twins up to approx 1956. Please refer to your parts catalog for proper