BSA Swing Arm "Hollow Spindle" Shaft (1) 42-4340 - A50 / A65 / B31 / A10 Triumph these are much better quality

these are much better quality then the original Lucas ammeters from the 1950's through the 1960's

Well here is a chance to replace them

Horns come supplied with a black painted finish

Looks strikingly close to the Original Steering Dampers

Bulb holders are sold individually - use drop down menu to select which holder type & brand you desire

BSA Swing Arm "Hollow Spindle" Shaft (1) 42-4340 - A50 / A65 / B31 / A10 Triumph these are much better qualityNew 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