This coil measures 2 7/16" in the body, 7/16" core diameter and 1 3/8" body diameter. It is brand new, with uprated internals and it is gaurenteed. It also has the correct disc type ht pick up. Sometimes refered to as the 2871 coil
It fits models: 8D (Early models), 9D (Early models), Junior, Junior deluxe, Also fits the welbike.
Plus many indutrial models including the mark 40 mk40.