That hose is just a vent tube. I have never had one leak anything. Is the trans over filled with oil?
Forks could be from anything from the late 80's like 125, 250, 500, or even a klx. Definitely not kdx cuz it doesn't have the trip meter gear housing provision. Measure the diameter of the chrome tube and we can start to narrow it down from there.
If you want to put it back to factory forks I do have everything except the cable and trip meter off a 91. Forks need new seals and oil. front wheel/hub is in good shape. Bearings seem to be useable but personally I would put new ones in since they are cheap. trip meter gear housing is in great shape after I cleaned all the grease and dirt out of it. Axle is also in good shape. Triple tree is clean, bearings may clean up and work just fine but they are covered in dirty grease and don't roll very good at the moment. Everything is out in the shed on a shelf.