See more: Ignition Parts
C. Spark control wire to cylinder clamp 1938-1948 UL Big Twin , Parkerized, Colony (OEM 3393-38, 56627-38)
VL and UL Big Twins are also known as Side valve or Flathead, EL Big Twins are also known as OHV or Knucklehead, FL Big Twins mentioned below are also known as OHV or Panhead.