I used
SWMotech 25mm risers with original (made of cheese) handlebar on my first Tenere. Fits perfectly and no extra parts needed.
Now on my second Tenere I use Renthal RC High Fatbar with Protaper bar-clamp adapter wich is a much better solution IMHO but a lot pricier. The accelerator cables are a little on the short side but nothing dangerous.
Cheers,
Ionut