This is a very nice reproduction of the Z50 K3-78 chain guard (This item was discontinued by Honda).  It technically is for the K4-78 models but will also work on the K3 model which uses the same guard but is chromed rather than painted black.  We also have the K3 chrome type available if you prefer chrome over paint.  Replace your rusty pitted old chain guard with this one for a nice clean look at an affordable price!