Bring the snow

The new adapters extend the lines of the housing and re-use the side plate and rubber gasket in the same manner. One drive unit can now be swapped between 68, 73, 83 and 100mm BB widths. 

100mm spacer and rubber cushion installed on my gently abused  test unit

The 100mm adapter allows space for the motor wires

100mm on the left, 83mm on the right. The 100mm is a snug fit over the housing providing a more than adequate brace for the left side plate.