need help with 4" agricultural

hi which pipe for shaft oiler and with one for cylinder oiler and the pipe for diff oiler under the water pump the ends are off a fine thread ok to go in to shaft but the over end with goes in to oilers up on plate is course

My modelworks Agri the pipe that goes down to the mid shaft on the left just pushes into the shaft oil hole, there's no actual nut and olive joint its just a push fit into that shaft, are you sure you're using the right pipe ?

Of course it may have changed now ?