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Home Motorcycle Spare Parts AJS Stormer 250/370/410 Section A1, A2, A3 & 410 - Engine A2 - Y4mk2 Y40 250cc engine STUD, CYLNDR HEAD. 5/16" DIA.
5/16 UNC Stud, cylinder head to cylinder fixing.Fits:Stormer 250, 370, 410