Here's a link to a three-part series on how to make your own adjustable rear swaybar using off the shelf circle track stuff (Speedway or Coleman).

This gives you an almost unlimited choice of diameters and, in the case of lighter, hollow bars, different wall thicknesses.

Enjoy!
Part 1:
http://www.redpepperracing.com/forum...dpost&p=364794
Part 2:
http://www.redpepperracing.com/forum...dpost&p=367277
Part 3:
http://www.redpepperracing.com/forum...dpost&p=372796