Søren Ladegaard writes:

For the 2013 season Seedwings Europe offer wheels for the
following base bars:

- Round 28 mm

- Seedwings / Bautek airfoil (haven't seen those anywhere before)

- Wills Wing Litestream

- Wills Wing carbon

- Aeros carbon

Check them out here:
http://www.seedwings.at/en/accessories/wheels/wheels.html

Or in the US
here.