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B. Spark control coil to frame clamp 1937-1946 EL Big Twin, Parkerized, Colony (OEM 3393-37, 56626-37)
VL and UL Big Twin are also known as Side valve or Flathead, EL Big Twin are also known as OHV or Knucklehead, FL Big Twin mentioned below are also known as OHV or Panhead.