you don't most manufacturers are from china with no parts available
it depends on where its coming from
Depends on where it is leaking.
oil leaking on the ex man fold need to fix the oil leaks
If the oil sending unit is leaking oil by the inside of the component, then I don't know of any way to fix that other than removal and replace with another one. If it is leaking by the threads, then you can try teflon tape to seal that. Also make sure it is leaking from the sending unit and not leaking down from the valve cover.
antifreeze leaking into the oil pan
tape
the only true way repair the leaking oil pan it to remove the pan and change the gasket their is no quick fix for a leaking oil pan if you do it right the first time it wont bie you in the but latter
The repair depends on where it is leaking oil. As you didn't list the location it is impossible to give an answer.The repair depends on where it is leaking oil. As you didn't list the location it is impossible to give an answer.
replace the housing o ring
First you need to diagnose the source of the leak then we can help you fix it.
You can do a DIY fix on a punctured oil drum using metal mesh, pliable tiles, and a metal grade heat resistant epoxy in order to keep the oil from leaking with the aid of a mechanic.