Brand Spankin’ New Top Quality Lucas Type Head Light U39 “Short Knob” Lighting Switch. We are absolutely Blown away by the Quality of this New Reproduction Part! Looks almost Identical to the Original types! Keep in mind that this Switch is far more Affordable then an Original Lucas Switch but without Sacrificing Quality! Your saving upwards of $100+! Measures 2″ In Diameter & Features 3 positions; Off, Low & High. Used on many British bikes that include some of the Following: BSA, A7, A10, Ariel, Velocette, Triumph, Norton & More during the late 1940’s to 1950’s with Magnetos & Dynamos! Please refer to your parts catalog for proper fitment.*****Please note that this Switch will also fit other British Motorcycle models that are not listed abouve! Check your parts book!*****We also stock this Same Lucas Type Switch in the “Long Knob” Style! Search 31315Made in TaiwanO.E.M Part number is U39 & 31340