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you can not mount your alternator
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Although the box states "Triumph & BSA Twins" this module will work on 12 Volt Triumph/BSA Unit Singles and Norton Commando models as the internals are the same
then you will need this Harness
Also fits various Triumph Cub models
BSA Swing Arm "Hollow Spindle" Shaft (1) 42-4340 - A50 / A65 / B31 / A10 70-4587 you can not mount yourNew BSA Unit Twins "Hollow" Swing Arm Spindle Shaft. If your in need of a New Swinging Arm Spindle then this is exactly what you need! Comes with a lovely Zinc Plated finish! Measures 10" 12 16" including the side plate with a thread pitch of 20 TPI! Fits all BSA Unit Twins (Lighting, Royal Star, Hornet, Thunderbolt, Spitfire, Etc) from 1962 1968 only. Also fits many A & B Group BSA Pre Unit Twins & Singles that feature the "Cross Over" Rear Brake