The series B uses a taller head, the A series is the common one used in buggies and scooters. Many selling on e-bay are in the business of selling parts. Choose someone who actually repairs and rides these things. As the old saying goes, "you get what you pay for".Some of these Chinese manufactures use good quality standards but many do not. Cheap usually means a cheap product such as type of metal or inferior techniques to manufacture.
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