Plastic speedo drive. AUG gearbox

Just fitted 5speed AUG gearbox in to my mk1 caddy
went fit speedo cable pulled out old flang where cable being chopped
no drive.
Tryied my green drive in hole but just seemed drop in
anyone know which colour needs be 

red drive for aug box, you might find the old one has fallen off in the gearbox

Thank you I will order red drive.  
No nothing in side gearbox what I thought as well