Marky did it, there is a thread with lots of pictures. The front from an F650 single (Dakar version has 21" front) will bolt in with the twin spacers, just flip it around to get the brake disc on the right side.
The 17" rear from an F800GS will bolt right in as well. You can also make a KTM 950/990 18" wheel fit, but it will require some custom spacers and an adapter plate for the brake disc. Not quite finished with mine yet, but it's from a 950 Super Enduro and has a super strong 2.5" wide Dirt Star rim.