The lower of the three transfer gears, the input gear, which is attached to the gearbox on the 1st motion shaft.
Input Gear 4-synchro gear.
24 teeth.
It can be used on 3 synchro but the stem part is shorter so you will need to use a spacer by cutting up your old 3 synchro input gear to act as a spacer.
Limited stock, one per customer.