I would think most of the aftermarket / universal towers would fit. With how far back the driver is it's hard to tell how the tower would fold down. Do you need it to fold down for storage?
There are ski pylons from swivleze ( http://www.swivleze.com/
) that may be a good option as well.
If you want to make it yourself check out www.diyTower.com
for other projects you can learn from.
(Message edited by MonsterTower on May 16, 2005)