Hi,
The Wanhao Duplicator I3 is based on an open source printer (the Prusa i3) but it is not a Prusa i3, and is not open source any more.
Actualy Wanhao will not communicate any other information than the operating manual of its printers.
The MK10 extruder is known as the weak point of the Wanhao Duplicator i3.
You can still make upgrades on any part, but if you can't find a custom part on thingiverse or elsewhere,
you will probably need some CAD design skills to make the part you need, and your best friend will be a pair of digital calipers
++JM