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The WD Motorcycle forum
I think you'll find the original size was 3/16 BSF but most of us will use 2BA. Here is a good guy for BA fixings. http://www.ba-bolts.co.uk/ Ron
email (option): ronpier@talk21.com
Original size is 3/16 cycle, 32 tip. The nearest size is AF,10x32. The angle is the only difference. Don't know why the American's used 10 instead of 3/16 but they did just to confuse us.